How To Fix EK801 - Different data in billing document &1 for contract &2

EK801 - Overview

• Message type: E = Error

• Message class: EK - IS-U Accounts Receivable and Payable

• Message number: 801

• Message text: Different data in billing document &1 for contract &2

What causes this issue?

At least one of the following conditions for
<DS:GLOS.2A7E8A9C5C28D311B60F0060B03C2BFF>payment plans</> is not
fulfilled in billing document &V1&:
A definite allocation date could not be determined.
The allocation date in at least one of the billing line items is
different than in the other lines of the document.
Only for payment plans of
<DS:GLOS.AC4825FB7773D411A4950060B03C3B0E>Type</>
<DS:GLOS.EB4CB0AB7473D411A4950060B03C3B0E>BBP procedure</>:
The <DS:GLOS.3526BDE1AFAB52B9E10000009B38F974>portions</> in the
concerned billing documents must match.
A different currency appears in at least one line.

System Response

Since determination of a definite allocation month is required for
determining the relevant month for the payment plan, payment plan
preparation cannot be executed for this contract.
There is no guarantee that all contracts are billed for the customer on
the same day if the portions do not match. There is also no guarantee
that the same payment amount will be determined for all billing dates.
If the currency is not the same, then the bill amount cannot be divided
sensibly.
Invoicing of this billing document and the entire invoicing group has
been terminated.

How to fix this error?

If the contract is to remain allocated to a payment plan, then make
sure that the allocation date, the portion, and the currency remain
clearly identifiable. Otherwise, the payment plan has to be terminated
for this contract, and the information for terminating the payment plan
also has to be clearly defined.

Error message extract from SAP system. Copyright SAP SE.

EK801 - Details

• The SAP error message EK801 indicates that there is a discrepancy between the data in the billing document and the contract referenced in the system. This error typically arises in the context of billing processes, particularly when dealing with contracts and their associated billing documents.
  
  Cause:
  The error can be caused by several factors, including:
  
  Data Mismatch: The billing document may contain data that does not match the contract details. This could include differences in pricing, quantities, or terms.
  Contract Changes: If the contract has been modified after the billing document was created, the changes may not be reflected in the billing document.
  Incorrect Billing Type: The billing type used may not be compatible with the contract terms.
  Incomplete Data: Required fields in the contract or billing document may be missing or incorrectly filled out.
  Custom Logic: If there are custom enhancements or user exits in the billing process, they may be causing unexpected behavior.
  
  
  Solution:
  To resolve the