SAP Note 19942 - Considering a manually changed group condition

Symptom:

Case 1:
A group condition changed manually in a document item is not taken into account during determination of the scale base value for the remaining items.

Case 2:
A billing document is created, for example with billing type F2.If you now carry out a new pricing for an item, the remaining items are not included in determination of the scale base value.

Cause and prerequisites

This is standard system behavior.

Solution
This function can be reached with a new formula for the group key.Use Transaction VOFM to create this formula (for example 90) and assign it to the condition type. It appears as follows:
FORM FRM_GRUPPENKEY_090.

XVAKEY = '090'.
GKOMV_KEY-KSTEU = SPACE.
GKOMV_KEY-KYBTR = 0.
GKOMV_KEY-KHERK = SPACE.
ENDFORM.

You must take Note 381348 into account.