Diagnosis
V2 payment plan items exist in the system for the insurance object-
business partner relationship &V3& / &V4&.
However, you specified that you want to display a maximum of &V1&payment plan items.

System Response
This restricts the functionality on the Payment Plan andPayment Plan Items tab pages. It is not possible to create andchange any payment plan items.
The check takes place here for all insurance object-partnerrelationships for insurance object &V3&. This functionality isrestricted even if you have selected a different business partner toV4 on the initial screen.

Procedure for System Administration
In the Customizing setings (Activate Performance Improvement for theInsurance Object Dialog IMG activity), you have the option ofspecifying a default value for the maximum number of payment plan itemsto be displayed.