Hi,
You need to check the date profile for the transaction and item category are same or not. The following notes will help to understand the behavior:
• If the same date is assigned at item level as at header level, the dates in the header are taken over at the item level. They are not re-determined.
• If a different date profile is assigned at the item level than at the header level, the following applies:
o the date types, for which date rules exist are re-determined at the item level.
o the date types, for which there are no date rules are taken over from the header, if possible. (If no date is determined at the header level, this field also remains empty at item level!)
If dates at the item level differ from the header, they are not passed on when date changes are made at the header level.