Custom field enabled not available in UI in app Post General Journal Entries

[SAPSupport]

APP: Custom fields, enables Posting General Journal entries, but APP: Posting General journal entries, fields cannot be added

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[SAPSupport · Accepted solution]

See help.sap.com documentation on App Extensibility: Post General Journal Entries 

https://help.sap.com/docs/SAP_S4HANA_CLOUD/0fa84c9d9c634132b7c4abb9ffdd8f06/e5defe0a850948d1bd7a2834...

"Key users can extend the app in the Custom Fields and Logic app using the business context Coding Block.

You can add fields to the following UI elements using UI adaptation at runtime:

note 2453614 - FAQ: Universal Journal Extensibility

outlines that Coding Block extension in SAP S/4HANA Cloud Public Edition is Available in Fiori Reuse UI for many transactions that post journal entries, 

It is not used for customer or supplier line items (account type D or K in ACDOCA table), but derivation is possible with FIN_CODING_BLOCK_SUBSTITUTION enhancement option.

In relation to S/4HANA key user extensibility using Custom Fields and Custom Logic apps and Journal Entry Item business context

Field values cannot be entered manually, but display is possible in Manage Journal Entries Fiori app, 

See also kbas
2642121 - Custom Field for Journal not available in Journal Entry app

3448139 - Manage Journal Entries Extensibility

 3491508 How to add the custom fields in payload for Journal Entry API - SAP HANA Cloud?