How To Fix PAIS021 - There is no valid expand structure for table infotype &1

PAIS021 - Overview

• Message type: E = Error

• Message class: PAIS - Messages for PA-IS (Ad Hoc Query etc.)

• Message number: 021

• Message text: There is no valid expand structure for table infotype &1

What causes this issue?

The system has identified this infotype as a table infotype because it
has an entry in the TBTAB field of table T777D. Table infotypes require
you to enter the name of an infotype expand structure in the PPNNN_EXP
field of table T777D. This entry is either missing or invalid.
The infotype is only available in restricted form in the InfoSet. It is
not possible to report on the fields of the table division.

How to fix this error?

Check that the infotype is, in fact, a table infotype. If it is, you
must ensure that the TBTAB and PPNNN_EXP fields of table T777D are
maintained correctly. You must then create the InfoSet once again.

Error message extract from SAP system. Copyright SAP SE.

PAIS021 - Details

• The SAP error message PAIS021, which states "There is no valid expand structure for table infotype &1," typically occurs in the context of HR (Human Resources) modules when there is an issue with the infotype structure or configuration. Here’s a breakdown of the cause, potential solutions, and related information:
  
  Cause:
  
  Missing or Incorrect Configuration: The error often arises when the system cannot find a valid "expand structure" for the specified infotype. This can happen if the infotype is not properly configured in the system or if the necessary structures have not been defined.
  Custom Development Issues: If there are custom developments or modifications related to the infotype, they may not have been implemented correctly, leading to this error.
  Transport Issues: If the infotype or its associated structures were transported from one system to another (e.g., from development to production), there may have been issues during the transport process.
  Version Compatibility: Sometimes, the error can occur