3208626 - ALTER TABLE reports a warning to check the validity of the default value - SAP ASE

You may get the below warning when you run ALTER TABLE to change column datatype.
How to check the validity of the default ?

1> alter table testtab modify col2 varchar(300)
2> go
Warning: a default (object id 1232004389) is defined on column 'col2' being modified. Check the validity of the default value after this ALTER TABLE operation.

SAP Adaptive Server Enterprise 16.0

warning, alter table, default value, the validity of the default value , KBA , BC-SYB-ASE , Sybase ASE Database Platform (non Business Suite) , BC-DB-SYB , Business Suite on Adaptive Server Enterprise , Problem