You need to link that "column attribute" to an expression.
I'll call it "COLUMN_EXP"
Attributes, "DESCRIPTION" & "CATALOG" need to be linked to their own expressions. "******_EXP"
Now all contents of all three are in the expression system and then you can apply the logic.
"COLUMN_EXP"
if (CATALOG_EXP = "") (MW_STOCKSIZE_EXP) else (CATALOG_EXP)
This method works fine but it doesn't allow the COLUMN attribute to edited directly anymore without breaking the link to the "COLUMN_EXP"
It would be great if there was another variable that would allow a unique input to "COLUMN".
If so could it may be possible to super-cede the expression without breaking the link.
Dave
Automotive Tooling / Aircraft Tooling / Ground Support Structures
NX9, Win 7 Pro SP1