How To Fix NI100 - Invalid call of PO change via function modules

NI100 - Overview

• Message type: E = Error

• Message class: NI - Document index processing

• Message number: 100

• Message text: Invalid call of PO change via function modules

What causes this issue?

The function modules for the fully automatic changing of purchase
orders have been invoked in the wrong sequence. The correct sequence
is:

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

ME_PURCHASE_DOCU_DATA_REFRESH
ME_PURCHASE_DOCUMENT_DATA_READ
ME_PUR_DOCU_HEADER_CHANGE
ME_PUR_DOCU_POSITION_CHANGE
ME_PURCHASE_DOCU_DATA_CHECK
ME_PURCHASE_DOCUMENT_DATA_SAVE
Data inconsistencies may be caused if this sequence is not adhered to.

System Response

How to fix this error?

Please bring the function module calls into line with the sequence
shown above.

Error message extract from SAP system. Copyright SAP SE.

NI100 - Details

• The SAP error message NI100 "Invalid call of PO change via function modules" typically occurs when there is an attempt to change a Purchase Order (PO) using function modules in a way that is not allowed or is incorrectly implemented. This error can arise in various scenarios, such as during custom development, data migration, or integration processes.
  Causes:
  
  Incorrect Function Module Usage: The function module being called may not be appropriate for the operation being performed. For example, using a function module designed for creating a PO instead of one for changing it.
  Missing or Incorrect Parameters: The parameters passed to the function module may be incomplete or incorrect, leading to the system being unable to process the request.
  Authorization Issues: The user executing the function may not have the necessary authorizations to change the PO.
  PO Status: The Purchase Order may be in a status that does not allow changes (e.g., if it has