Field help (REL0SAC) 

Collective account of the open items to be integrated in the statement.
The BP collective account is entered by default.
It is mandatory to enter a collective account if the statements are posted or if multi-collectifve accounts are prohibited.
The collective account must be compatible with the BP. Combining these two values makes it possible to specify if the statement is of type 'supplier' or 'customer'.

SEEINFO This is an important concept to understand the balance of the statement and know if it needs to be carried forward or not.

The initialization of the code for the Control field depends on whether or not the BP/Company tab is present in the BP record (GESBPR).