SAP Production Planning Table

There's one exception in PP-PI, where you can use batch specific unit of measure. That is,
you can define batch level alternative unit of measure. For example, you may have a
liquid, and it may have Liters as base unit of measure, and it may also have the percent
based active ingredient, that is Liters of the Active Ingredient can be an alternative unit of
measure.
So, every movement of material in the system will be done using 2 unit of measures at
the same time. e.g. goods receipt of 100 Lt liquid (which is also 80 Liters of Alcohol,
because of 80% alcohol potency), for the first batch. also goods receipt of another 100 Lt
liquid (which is 60 Liters of Alcohol this time, because of 60% alcohol potency) When
you look at your stock, you will see 200 LT liquid, which is equivalent to 140 LT Alcohol
ingredient.
What's the use of this active ingredient data during MRP?
When you define the batch unit of measure, you define limits for it. Say, our liquid in
previous example can only be between 50% and 90%, therefore we define it like that.
Every time we receive this material from vendor, we make the quality inspection and
determine the Alcohol percentage. however, while running MRP, system will create
purchase requisitions, but it doesn't know the percentage of the liquid our vendor will
send.
How will it determine the correct quantity?
In this case, we define a percentage for MRP, and MRP will use that percentage for
calculation. e.g. if there's an industry standard that all vendors of that liquid produce it at
75%, or if we are always working with a vendor who produces 68%, then we can enter
this data (per material) and MRP will calculate with that percentage.
Jayant
Fast Links: What is Firming Type in the MRP Types
The firming type dictates the behavior of planning with PTR (Planning Time Fence), i.e
whether the system should automatically firm the unfirmed planned orders and purchase
requisitions, which are outside the PTF as they move to fall within PTF as days progress
and also if new planning proposals are needed to be created to cover the shortage within
PTF.
There are five firming types, viz. 0, 1, 2, 3, and 4.
Listed below are the characteristics of these four firming types:
0 - PTF has not effect on planning.