Hans wrote:

> Try to make a DML statement with it ..

I got a field name not found error message with it in IBO
(v4.8.7)... I do not get error in FlameRobin.

I can avoid the error in IBO by doing this:

select '' AS BLANK, 'A' AS ABC from RDB$DATABASE

so I suspect the problem you have (you dont actually explain
what problem you experience) may due to some parsing artifact
in ibo/delphi related to that doubled single-quote followed
soon after by another single quote.

--
Geoff Worboys
Telesis Computing