I've worked at target 5 years now, always salesfloor.. I've asked and no one could really tell me in backroom and I searched the guides, only mentions of it, never a definition ...
What the hell is the accumulator? I understand it has something to do with the stock and it can be damaged by pulling incorrectly.. But.. How does it work etc.. Always been curious.. If you can point me somewhere I missed on the forum I'll delete the thread
The accumulator is a "server" in every store that keeps counts of everything being sold, defected, and pulled from the stockroom. It works in a series of + and - quantities and takes action based off of certain percentage values tied to each DPCI.
An easy example is something like Paper Towels. Let's say 10 fit on the shelf in the aisle and that is the only location. It is full on the salesfloor so its value is currently set to 0. If one sells, its value increases to +1. If its trigger is set to pull at +7 (or 3 left on the shelf), then it will drop into an autofill to pull those 7 (attempting to decrease the value from +7 to 0 again). When the backroom goes to pull their batch, and they key 7 it is a -7 (Subt or PULL both will do this), and it drops the value to zero again and will stop pulling until more sell. If there are only 5 left in the backroom then it is the +7 - 5 = +2 so it will come up as PUSH on the next trailer when it does come in.
Where this gets tricky is SPs and multi-locs. Let's say that this same Paper Towel is on a focal endcap. It fits 50 on the endcap and 10 still in the home like above. That gives it a total capacity of 60. If you start with it full the value is obviously still 0. But what about when it sells down a ton on a Saturday? You could have values of +45 (so only 15 left) and you need to kill your SP. You break the tie, stock everything into the home, and send the extra 5 to backstock. Just because you broke the tie does NOT mean the accumulator is reset. The value to the item to the accumulator is still +45. That is why an item will pull over and over again. The backroom will pull 5 at 11AM (decrease to +40), 12PM (+35) etc...
This is where Subt9999 comes in. Subtract does just what it sounds like, it subtracts from the accumulator. So that value of +45 can easily be fixed because you are performing -9999 to the accumulator on that DPCI. A value cannot go negative (only go to 0) so you have effectively reset the accumulator.
Furthermore, this is why EXF is not encouraged. EXF is not limited by capacities. So if you EXF 75 of an item you have made the accumulator +75 for it. If you only have 25 in the backroom, there is still +50 lingering around that will keep pulling whenever the item is backstocked. If EXF is used throughout the store, you can have hundreds of DPCI's every week with inflated values.