How To Fix 37042 - Specify both a field ID and a field name for the subkey

37042 - Overview

• Message type: E = Error

• Message class: 37 - Screen Painter

• Message number: 042

• Message text: Specify both a field ID and a field name for the subkey

What causes this issue?

When maintaining matchcode sub-keys for a screen field, you failed to
specify either the field ID or the field name of the matchcode sub-key.

System Response

To assign a matchcode sub-key to a screen field, you must specify both
the field ID and also a field name. Therefore the system rejects your
input.

How to fix this error?

With matchcode selections, matchcode sub-keys allow you not only to
assign a selected value to the screen field where you make the
matchcode entry, but also to fill other screen fields as a result of
the selection.
When you define a matchcode object in the ABAP/4 Dictionary, you can
assign a field ID to a matchcode field. If a matchcode record is
selected, the value of the field is attached to the field ID (as with
GET/SET parameters).
If there is a matchcode sub-key for this field ID, the system places
the value attached to the field ID in the screen field whose field name
is specified as the relevant sub-key field name.
The functionality requires you to specify both a field ID and a sub-key
field name for a matchcode sub-key.

Error message extract from SAP system. Copyright SAP SE.

Smart SAP Assistant

• What is the cause and solution for SAP error message 37042 - Specify both a field ID and a field name for the subkey ?

  The SAP error message 37042, "Specify both a field ID and a field name for the subkey," typically occurs in the context of customizing or configuring SAP applications, particularly when dealing with field definitions in the data dictionary or when creating custom fields in a table or structure.
  
  Cause:
  This error arises when a subkey is being defined without providing both the required field ID and field name. In SAP, when you are working with subkeys (often in the context of customizing data structures or tables), you need to specify both the identifier (field ID) and the actual name of the field. If either of these is missing or incorrectly specified, the system will throw this error.
  
  Solution:
  To resolve this error, follow these steps:
  
  
  Check Field Definitions: Go to the relevant transaction (like SE11 for Data Dictionary) and check the definitions of the fields you are working with. Ensure that both the field ID