Hello,

I have a strange invalid external reference in a workbook

Sometimes when I close the workbook I get the following message:
Your formula contains an invalid external reference to a worksheet
....
(No error at opening of the workbook).

The problem is that:
- I don't know wich of the 15 worksheets causes the problem
- I can't repeat the problem
- the Edit; Links menu option shows nothing (not highlighted)

can anybody help me

Regards Peter