Hi again,

a bit of a steep learning curve for me so far!

What I have is a form with one set of fields such as:
Doc No, Doc Rev & Planned Start Date

and a subform with fields such as:
Transmittal, Status, Planned Start Date

As you can see, the Planned Start Date appears on both (from different
tables). The subform data is editable. What I'm trying to do is set a
conditional format of disabled to the subform field if the main form's field
contains a value...

E.g.

main form has:

Doc No Doc Rev Planned Start Date
0001 A 31/10/09

Subform has

Transmittal Status Planned Start Date
00-001 Pre (greyed out)

I've tried a few different expressions with no joy. Any ideas on how to go
about this?

Thanks as ever,
Marc