Symptoms
Assume that you create a non-dbo user with DDL admin permission in SQL Server 2017 database that has Merge Publication enabled. When the user tries to alter the procedure, the user may receive an error message that resembles the following:
Msg 21050, Level 16, State 1, Procedure ProcedureName, Line LineNumber [Batch Start Line LineNumber]
Only members of the sysadmin fixed server role or db_owner fixed database role can perform this operation. Contact an administrator with sufficient permissions to perform this operation.
Status
Microsoft has confirmed that this is a problem in the Microsoft products that are listed in the "Applies to" section.
Resolution
This issue is fixed in the following cumulative update for SQL Server:
About cumulative updates for SQL Server:
Each new cumulative update for SQL Server contains all the hotfixes and all the security fixes that were included with the previous cumulative update. Check out the latest cumulative updates for SQL Server:
References
Learn about the terminology that Microsoft uses to describe software updates.