>>>I get the new detail line data in a modal form, total the invoice (using CALCULATE SUM), and refresh the grid so that the new line will show up. The grid goes blank whenever I refresh it. I have tried SEEKing the InvNo in INVHEAD to re-align things prior to refreshing --to no avail. All of the detail is there--it re-appears as soon as I page back to the target invoice once I have completed it. TABLEUPDATEing the detail has no effect. What am I missing?

Let me guess, you set a multifield relation between these files.

I am having the same problem, It works when I use a single field relation but not in the other case.

Tell me if you got the answer...

Good Luck