3524786 - Errors 13944 and 11050 when altering table - SAP ASE

Errors when running alter table command to modify a column:

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Msg 13944, Level 16, State 1:
Server 'asesp04pl04', Line 1:
ALTER TABLE 'taba' failed. This MODIFY operation can only be performed on computed columns. Column 'colc' is not a computed column.
Msg 11050, Level 16, State 132:
Server 'asesp04pl04', Line 1:
Adaptive Server cannot process this ALTER TABLE statement due to one or more preceding errors. If there are no preceding errors, please contact SAP Technical Support.

SAP Adaptive Server 16.0 SP04

Errors 13944 11050 alter table This MODIFY operation can only be performed on computed columns cannot process this ALTER TABLE statement due to one or more preceding errors , KBA , BC-SYB-ASE , Sybase ASE Database Platform (non Business Suite) , Problem