Dear Ansh,
In Document splitting, the system classifies individual document items and the documents. This takes place using your settings in Customizing. Each classification corresponds to a splitting rule in which it is specified how document splitting is to occur and for which line items.
As you said the document was posted when Splitting is deactivated, Just do as mention below-
1. Identify the documents which is posted without Splitting character (eg Pcr , Business area , segment)
2. Block all user for posting and Deactivate document splitting.
3.Reverse the all document which was wrong posted
4.Activate again Document splitting and Post all document again.
Please read OSS note 891144 first.
Regards
Raheem