I am trying to create a form that utilizes 2 subforms - one to link toa table
with customer contact info (linked fields - [CustomerID]), the other to link
to a table that keeps track of equipment lent to the customers (linked fields
- [LoanID].) The main form has the [LoanID], as well as the loan date, and
return date. This is based on yet another table.

Problem: the main form and customer contact subform work OK. But, the loan
items subform does not open in the main form. The error message I get is:
"This expression is typed incorrectly, or is too complex to evaluate...Try
simplifying parts of the expression by assigning parts of the expression to
variables."

I am a very simple user of Access - and do not code. I have been able to
make pretty complex programs using only the drag and drop apps and queries.
So please explain to me what, in theory I am doing wrong... like, should this
be based on a query instead of direct tables, or something like that.

Thanks.