DM; P2P; PTM
MD04; MM02
The best way to learn is by doing, so welcome to the video service that unlocks and reveals the hidden value in your SAP system. Hi, Martin here, and in this video we'll be taking a deeper dive into safety stock. Now in today's video, when we say safety stock, we are referring to static safety stock maintained in the material master. This is the flavor of safety stock most commonly used and therefore most familiar to most MRP controllers. It's one of the key decisions that needs to be regularly reviewed, and those discussions and approvals tend to be a cross functional in nature. Kristie, how about you tell us more about safety stock and specifically the static safety stock that we just called out. Kristie: Well, Martin, it seems that this is a high area of interest for folks. So what we're going to do today is take a deeper dive. Now, there are two major areas of discussion around safety stock. The first is what flavor is it, static or dynamic or safety type? Which one is best for [00:01:00] which planning situations and how do you determine a good value? And then the second is what the safety stock is actually going to do and how it should be thought about in the planning results. In this video, we are going to be focused on the latter. You've determined a value and now you're going to see how the system is going to respond. SAP has some options for us here and I'm going to get in and show you. What, where and how those options may play out. We will also touch on what a static safety stock might be a good fit for and some situations where it may not be a good fit. And lastly, what a good cadence of review might look like depending on what season of planning the business you're in. Let's get into it. All right, let's go in and take a look at the planning situation for this material with some safety stock on it, and what you'll see here is that we have an exception message 96, and if I double click on it it's going to give me the definition down here. So it says stock fallen below safety stock level, and we can [00:02:00] clearly see that. So our available quantity on hand right now is 87 pieces, and we have a safety stock of 100 pieces. That leaves our available stock balance at negative 13 pieces. Safety stock comes off the top, so it's the very first thing that MRP is going to plan for, it's the very first demand that it's going to see. ~Okay? And so,~ From here, it's going to go out and plan the rest of the month for us and start to get our replenishment in order. So the static safety stock needs to be looked at regularly, that's the very first thing that we want to make sure that we're mindful of. We don't want to change it too often, but we do want to make sure that we're going through and we're reviewing our safety stocks on at least a quarterly basis and dealing with any outliers. ~okay? And that is becomes very, very important. ~And then if there's a major forecast change, or if an item switches to a different point in the product life cycle, then we also would want to be able to go in and look at that and review it at that point as well. ~Okay,~ So some things that we want to consider as we're thinking [00:03:00] through our safety stock value, and I'm just going to go ahead and navigate here and remind you of where this lives, so it lives on the MRP2 view, and you'll see it right down here, ~okay,~ and we have the option of defining the safety stock level ourself or using an MRP type in conjunction with a service level that we're trying to achieve and having SAP go in and calculate that value for us. ~Okay,~ And that's a very interesting way to go about things, but most organizations are calculating this in some way either ~um,~ outside the system using another tool, and in some rare cases also using that feature in SAP that most people don't know about. So we'll have another video to explain that, but when we're thinking about safety stock and reviewing it, any changes, significant changes, in our lead time, in our minimum order quantity, in our lot sizing procedure, variability, new customers or structural changes to our forecast or in our product life cycle would cause us to want to go in and [00:04:00] review this, and you can see we've got this set right now just so it's really easy for us to see what's happening with the planning, which is the planned delivery time of 0 and in house production of 0 as well. So let me go back over here and we can see that this is also lot for lot with a minimum lot size of 3 and we do have a planning time fence out there of 7 just to park that demand out at the end of it. The other option that you have when it comes to your safety stock is you can make a decision on how much of this safety stock is considered available to planning. Now, as a general rule, you want to keep this as simple and as straightforward as possible and so most cases, your safety stock value that you see here is not going to be available to MRP, meaning that we want to honor the full 100 pieces. But you do have the ability to dampen the noise a little bit and let's say your safety stock is a 100 pieces, [00:05:00] you actually could change that so that it is considering a different value and i'm going to show that to you just so you can see what it looks like. I'll go to environment and change material and what we're doing here is we're actually controlling this by our MRP group. So let me go in and choose a different one here, I believe this one will do it and save And then right here from my navigation profile, let's actually switch that over. I'm going to switch to navigation profile, that's going to let me quickly go in and do the things that I need to do, which is going to include running MRP. So I'll go ahead and do that and save. Thank you very much for saving that, and now I've got my hotkey to go directly to MD02. It's going to let me run MRP. Go ahead and run that. And so the other thing that we can do is we can look at our periodic totals, which will help us to see how long that safety stock is actually going to last. So let me go ahead and [00:06:00] refresh. Okay. And what this actually is doing now, you'll see the values have changed over here. So it's letting me use some of that safety stock. I'll change it back here in just a moment so that you can see that again. So you'll see here we're swinging negative, we've got negative 69 pieces and when we come back here to our next replenishment, you'll see that we're able to actually go in and consume some of the safety stock, and what we've set it to is allow it to use 50 percent of that safety stock in planning. So that's an extreme level just so that you're able to see it today, but in general, ~first of all, I'll~ start first and foremost with being able to, ~um,~ have that safety stock stay clean and not use it in MRP, meaning you're not allowed to dip into that 100 pieces, you want to get that warning message immediately, get the exception message, and get the replenishment plans. But if for whatever reason you are in a position where you need to actually dampen that noise, you've gotten really good at keeping your safety [00:07:00] stock up to date, you're feeling confident with it, then you can actually choose to adjust the percentage ~of, um,~ of what it is that can actually be considered in planning, so, it's an ~alternate, um,~ alternate option there for you. What I wanted to show you also is this periodic total. So, we can actually come in here and see, let's look at our months, so we can see what our demand is over the next couple of months and that is going to help us to know how much we're covering with that safety stock. So, maybe that 100 pieces is way too high based on what it is that we are currently using. And you'll see here ~that~ that 100 pieces actually lasts us quite a long time, so this would be a good candidate for review, and bringing that back down, think about the class of the product and the variability. So your ~A, B, C, ~A, B, C and X, Y, Z, ~um,~ so your importance of that product and then the variability and how volatile it is to help you figure out how much coverage you're going to want. So a couple of different options for you there in terms of being able [00:08:00] to use that safety stock and set it up appropriately with a good cadence of review. Again, make sure that you don't change it too frequently, like if you're changing it every month, that is too often unless you are in ~you know,~ a very fast turning industry. And try to take a look at it based on ~you know,~ your own seasonality and review. And then make sure that you are triggering it with events like product life cycle management, reviewing to see what your usage looks like, and keeping an eye on those lead times and lot sizes to make sure ~that ~that safety stock still makes sense. Okay, so in summary, today we've taken a deeper dive into static safety stock and what the rules around it mean to our planning results? We still definitely have our floaties on on this topic and we could spend days actually workshopping it. However, we hope that this gives you a little more insight into the reaction of the system and the options for how safety stock can be used in the planning and availability checking. Remember that because it is static, it does not automatically change with the seasons, the [00:09:00] life cycles, or the changes in business dynamics. We are in control and we need a good cadence of review and adjustment that is exception based and at a frequency that makes sense. Back over to you, Martin, to bring us home. Martin: Once again, thank you Kristie. Brilliant. This is a hot topic and I don't see that changing anytime soon, frankly. Safety stock can be such an asset if planned well. I like the options and reminders we talked through today and hopefully that will support everyone with good reminders as they go into their next cycle of review. Choosing where you want to invest working capital, time, space and materials is a key decision in the planning process in any business that's a supply chain oriented. So folks, if you want to know more about this video and others, please check out our other catalogs and of course, if you have a particular question submit it below.