David,

I'm sure, I didn't do such a thing!!!! :)
This is my lcWhere expression: (from debugger)
ccode='13' and aa.ccode+aa.town=bb.County+bb.town

No substr at all...

>
>>>>It works fine, if I comment:
>>>>*!* set talk on
>
>Somewhere in your macro expansion you are attempting to use substr() past the end of string:
>
>x = "abc"
>? substr( x, 55, 5 )
>
>The current setting of TALK controls whether or not an error is thrown of if VFP just ignores your mistake.