How To Fix UAS138 - Key field &1 must be displayed

UAS138 - Overview

• Message type: E = Error

• Message class: UAS -

• Message number: 138

• Message text: Key field &1 must be displayed

What causes this issue?

For creation and processing of the object, key fields must not be
initial. The configuration tool prevents you from closing the window
because you have declared a key field as 'Invisible' without filling the
field by means of a formula. Therefore, the key field would always be
'initial'.

How to fix this error?

Assign a value to the key field declared as <LS>Invisible</> using a
formula at the time of creation (intialise or complete).

Error message extract from SAP system. Copyright SAP SE.

Smart SAP Assistant

• What is the cause and solution for SAP error message UAS138 - Key field &1 must be displayed ?

  The SAP error message UAS138, which states "Key field &1 must be displayed," typically occurs in the context of data entry or processing in SAP applications where a key field is required to be visible but is not currently displayed in the user interface. This can happen in various modules, particularly in those related to master data or transactional data entry.
  
  Cause:
  
  Field Configuration: The key field may not be configured to be displayed in the screen layout or user interface for the transaction you are using.
  Authorization Issues: The user may not have the necessary authorizations to view certain fields, leading to the error.
  Custom Development: If there are custom screens or enhancements, the key field might have been inadvertently hidden or removed from the display.
  Data Entry Errors: The user might be trying to enter data without the required key field being visible, which is necessary for the system to process the transaction.
  
  
  Solution:
  
  
  Check