How To Fix TU521 - Portion &3 of contract &1 does not correspond with portion &4 of contr &2

SAP Error Message - Details

• Message type: E = Error

• Message class: TU - Billing/Scheduling/Budget Billing

• Message number: 521

• Message text: Portion &3 of contract &1 does not correspond with portion &4 of contr &2

What causes this issue?

You have tried to execute a function (such as copy payment plan for
supplier change) for which it is necessary that the portion (&V3&)
allocated to contract &V1& is identical to portion &V4&, which is
allocated to contract &V2&.
In this case, this condition has not been fulfilled.

System Response

INCLUDE ISU_VERARB OBJECT DOKU ID TX

How to fix this error?

The system issues an error message and will not allow you to continue with this transaction until the error is resolved.

Procedure for System Administrators

Error message extract from SAP system. Copyright SAP SE.