1/ What if you have a single ALTER TABLE instead of 4?
2/ What if you get the expected columns specs right from your SELECT instead of using ALTER TABLE afterwards?

>I have a program that runs in Unattended Mode using SYS(2335). Occasionally (this weekend 5 out of 56 runs) an ERROR 2031 occurs on an ALTER TABLE line, mostly the last one hereunder. Error 2031 is: User-interface operation not allowed at this time.
>
>It is my impression that this is a VFP-error. In debugging mode it does not occur and the variable m.lcExportAlias is fine.
>
>Can it be that I should use the full table name - DBF() - rather than the alias? Any other suggestion?
>
>

*  These are sections, not the whole code.
>*
>lcTMPFile  = m.P_TempDir + TempName() + '.DBF'
>select * from EmpS0 into table "&lcTMPFile."
>lcExportAlias = alias()
>
>use in select( m.lcExportAlias )
>use ( m.lcTMPFile ) exclusive		&& It is a TABLE, not a cursor!
>lcExportAlias = alias()
>
>alter table ( m.lcExportAlias ) ;
>	drop mutdate ;
>	drop muttime ;
>	drop thesource
>
>alter table ( m.lcExportAlias ) alter COLUMN reason C(15)
>
>alter table ( m.lcExportAlias );
>	add EmpName 	C( cnMAXLenForName );
>	add EmpIndVol 	C( cnMAXLenForIndVol )
>
>alter table ( m.lcExportAlias ) alter column empno C(5)