June7, thanks for the suggestion. I read through the attachment and I did need a refresher on the value vs. control source names. I'm making progress because now I'm getting a different error farther into the processing!
I'll include what I'm working with now. I removed the reference to the main form frmAdvocateEventAdd in the master link field. I renamed the control source in the subfrmAdvocateEventInformation to txtAdvEventID from AdvEvent. I updated the master link to include the control source name rather than the field name. (I also updated the control source name for subfrmAdvocateEventYouthDetail, as I will be linking it as the master later on.)
subfrmAdvocateEventInformation (master)
Control source when AdvEventID is selected
Code:
=[subfrmAdvocateEventInformation].[Form]![txtAdvEventID]
; Name = AdvEventID
subfrmAdvocateEventYouthDetail (child)
Control source when AdvEventID is selected
Code:
=[subfrmAdvocateEventYouthDetail].[txtAdvEventID]
; Name = AdvEventID
Link on selected control of subfrmAdvocateEventYouthDetail
Link Master Fields
Code:
[subfrmAdvocateEventInformation].[Form]![txtAdvEventID]
Link Child Fields
Code:
[subfrmAdvocateEventYouthDetail].[Form]![AdvEventID]
Now an error message doesn't occur when I open the main form frmAdvocateEventAdd, but does occur when I try to add an Advocate to an Event.
"Microsoft Access can't find the field 'txtAdvEventID' referred to in your expression. You may have misspelled the field name, or the field may have been removed or deleted."
Thanks, again, for help.
Susan