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Time-Dependent Editing of Contract
Relationships 
When you edit a contract pool comprising a main card and participant cards in a card-account relationship, note the following restrictions to the editing time according to the function to be executed.
Depending on the product settings, as many contracts can participant in a card-account relationship as you wish. You are not allowed to create a hierarchy.
You can add participants to an account-card relationship at the current or at all future points in time.
You cannot add 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 remove each participant from the card-account relationship again. Note the following restrictions:
· The Fixed Participant indicator was set at creation.
· The root contract cannot be removed.
You cannot remove any participants 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.