3169251 - Solution ZCUSTCONTENTSOLUTION cannot be deleted, edited

Trying to delete the Solution ZCUSTCONTENTSOLUTION the following error occurs:

Solution ZCUSTCONTENTSOLUTION cannot be deleted (A3CSolution)

Message no. /SMB/BBPRJ_INST204

or

Trying to edit the Solution ZCUSTCONTENTSOLUTION the following error occurs:

ZCUSTCONTENTSOLUTION solution not a custom solution

Message no. /SMB/BB_INSTALLER338

SAP S/4HANA

/SMB/BBPRJ_INST 204, /SMB/BB_INSTALLER 338 , KBA , SV-CLD-ACT , S4H Best Practices – Generic Content Activation , Problem