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Time-Dependent Editing of Contract
Relationships 
When you edit a contract pool comprising an account and participant cards in an account-card relationship, note the following restrictions to the editing time according to the function to be executed.
You can create the cards that are participating in an account-card relationship in the dialog. Unlike when you add existing participant contracts (for example, to a master contract), the system creates new card data records.
You can create participants to an account-card relationship at the current or at all future points in time.
You cannot create any participants for time points in the past. This function is not provided in the dialog. The system issues an error message via BAPI and direct input.
You can change participants to an account-card relationship at the current or at all future points in time.
You cannot change any participants for time points in the past. This function is not provided in the dialog. The system issues an error message via BAPI and direct input.