Why do I get this error on my new product lookups? (error "Unknown Function Number -1")

Question: 

I’ve created a new main view for Products. It works well and can navigate and even search on the detail screen header. I am attempting to build the buttons for each label to seach on. I basically copied the code from the account detail form and pointed the case statements to the new product lookups. When I click on them, I get an error “Unknown Function Number -1”. What is wrong with my code?

Case “cmdsku” ‘
strLookup = “Product:ActualID”
Application.BasicFunctions.DoInvoke “Lookup” & strLookup

Ive even changed the doinvoke to a Function: Lookup. I still get that error.

Any ideas on this? My main view seems to work ok but I’m not ruling anything out.

Answer:

Check  the syntax at the end of the lookup line, should be a comma, not an ambersand symbol 

Sub FunctionLookupClick(Sender)
Dim strLookup
Select Case Sender.Name
Case “cmdSKU”
strLookup = “Product:Actualid”
End Select
Application.BasicFunctions.DoInvoke “Lookup”, strLookup