Activation Rules for Manual Payments

For an Argentine company code the system provides special activation rules for open items related to each other via invoice reference. Consider an open item (invoice) and several other open items related to this invoice via invoice reference (e.g. credit memos, debit memos, partial payments):

If the user switches to the partial payment screen, the related items are deactivated automatically, i.e. a partial payment amount for the group has to be entered in the partial payment amount field of the invoice.