Atp sap

1. Question:
Why does ATP not confirm anything even though transaction MD04 still displays the
available quantity and transaction MMBE still displays sufficient stock?
Answer:
You can only analyze the availability using transaction CO09. In transaction MD04, the
system does not calculate the 'Available quantity' field according to ATP logic. This means
that the system does not calculate theavailable quantities displayed here according to the
scope of check defined for ATP in Customizing. Also, the stock information shown in
transaction MMBE is not sufficient to draw any conclusions regarding availability. For
example, you cannot obtain any information here about the quantities that have already been
confirmed (which is necessary to calculate the available quantity).------------------------------------------------------------------------
2. Question:
Why does ATP not confirm anything even though I currently have stock and an issue
element only consumes the quantities much later?
Answer:
The ATP check does not recognize consumption as of a certain date.
For example, if you have 100 units in stock and a sales order with a confirmed requirement
of 100 units in 10months time, no stock is available for a sales order that requires stock for
the current date.
For more information about cumulation, see Note 547512 question 10 and the F1 help for
the cumulation in transaction OVZ2.
------------------------------------------------------------------------
3. Question:
Concerning the previous question: This is not flexible enough for me. How can I usequantities to confirm sales orders today even if the stock is reserved in the future?
Answer:
You can obtain the flexibility you want by entering the span of time within which you can
procure each quantity.
You enter this information as the replenishment lead time in the material master and the
scope of check.
If the replenishment lead time is set to three months, as in the example given in thequestion
above, the 100 units in stock are available for sales orders within the next three months.
Due to the replenishment lead time, the system confirms requirements that lie three or more
months in the future.
---------------------------------------------------------------------
4. Question:
The system displays a negative cumulated ATP (for example, in CO09). Is this a problem? (I
havethe same question concerning negative stocks.)
Answer:
Yes, a negative cumulated ATP quantity indicates a problem in material requirements
planning.
The technical background to this is that the ATP calculation of stocks and receipts first
deducts the negative ATP quantity, regardless of why or when this occurred. This can lead
to an incorrect result.
From a business point of view, there maybe various reasons for having a negative ATP
quantity that corresponds to an overconfirmation.
For example, a receipt element (purchase order or planned order) can be delayed or deleted,
and this can cause an overconfirmation or shortage.
Alternatively, sales orders are confirmed against the replenishment lead time (RLT), but
material requirements planning does not procure the stock (this alsocauses an
overconfirmation when the RLT is exceeded).
Negative ATP always indicates a problem (see also Note 153355).
This applies particularly to negative stocks. A negative stock indicates a discrepancy
between the actual stock and the stock saved in the database, and this is a problem you
should resolve immediately.
---------------------------------------------------------------------5. Question:
Why can I reassign quantities that have been reserved by a stock transport order at storage
location or batch level?
Answer:
Even though you can enter a batch in the stock transport order, this is only a default value
for the receiving plant. Additionally, the storage location that you can enter is a proposed
storage location in the receiving plant, and not in the issuing...