Form/Subform Data Linkage Problem

[sickenhoofer]

I am having some problems with a form and its subforms. It was designed to click on a list of numbers on a subform, which causes another subform's data to change to data relevant to the number selected.

Attached are 2 pictures: 1. snapshot of master form w both subforms; 2. snapshot of relationships for tables involved in problem. Here is the main set up info:

Table 1 = tblProviderMain
ProviderMainID (PK - autonum)

Table 2 = tblProviderNumb ers
ProviderNumberI D (PK - autonum)
ProviderMainID (foreignKey)

Table 3 = tblServiceLocat ions
ServiceLocation ID (PK - autonum)

Table 4 = tblProviderNumb erJoined2Locati on
ProviderNumberJ oined2LocationI D (PK - autonum)
ProviderNumberI D (foreign Key from Table 2)
ServiceLocation ID (foreign Key from Table 3)

Subform set up info:
Subform 1
Name = frmProviderNumb ers_BCBSList
Source = frmNumbers_BCBS (the source of this form is a qryNumbers_BCBS as follows)

SELECT [NumberType] & " - " & [Number] AS NumberAndType, tblProviderNumb ers.ProviderNum berID, tblProviderNumb ers.ProviderMai nID
FROM tblProviderNumb ers
WHERE ((([NumberType] & " - " & [Number]) Like "BCBS" & "*"));

Subform 2
Name = frmProviderBill ingNumbers_BCBS _sbfrm
Source = frmProviderBill ingNumbers_BCBS (source for this form is the following qryProviderBill ingNumbers_BCBS )

SELECT DISTINCT tblProviderNumb ers.ProviderNum berID, tblProviderNumb ers.ProviderMai nID, tblProviderNumb ers.EnterDate, tblProviderNumb ers.NumberType, tblProviderNumb ers.ProviderbyL ocationCode, tblProviderNumb ers.StateCode, tblProviderNumb ers.Number, tblProviderNumb ers.EffectiveDa te, tblProviderNumb ers.Termination Date, tblProviderNumb ers.Specialty, tblProviderNumb ers.Taxonomy, tblProviderNumb ers.EnrollDate, tblProviderNumb ers.TermEnrollD ate, tblProviderNumb ers.Reactivatio nDate, tblProviderNumb ers.GroupNumber , tblProviderNumb ers.Verified, tblProviderNumb ers.Source, tblProviderNumb ers.VerifyDate, tblProviderNumb ers.Status, tblProviderNumb ers.Comment, tblProviderNumb erJoined2Locati on.TRADPinNumbe r, tblProviderNumb erJoined2Locati on.ServiceLocat ionID, tblProviderNumb ers.BenefitCode , [tblLocations_Se rvice].[ServiceLocation ID] & " - " & [ServiceLocation Addr1] & ", " & [ServiceLocation Addr2] AS ServiceLocation
FROM tblProviderNumb ers INNER JOIN (tblLocations_S ervice INNER JOIN tblProviderNumb erJoined2Locati on ON tblLocations_Se rvice.ServiceLo cationID = tblProviderNumb erJoined2Locati on.ServiceLocat ionID) ON tblProviderNumb ers.ProviderNum berID = tblProviderNumb erJoined2Locati on.ProviderNumb erID
WHERE (((tblProviderN umbers.Provider NumberID)=[Forms]![frmProviderMain]![frmNumbers_BCBS List].[Form].[ProviderID]) AND ((tblProviderNu mbers.NumberTyp e)="BCBS"));

When end user clicks on a number listed on the left subform (frmProviderNum bers_BCBSList), an event procedure causes the detail of the subform on the right (frmProviderBil lingNumbers_BCB S_sbfrm) to change. Here is the coding for the event procedure contained within properties of first subform. It refers to control NumberandType.

Private Sub NumberAndType_C lick()
Forms![frmProviderMain]![frmProviderBill ingNumbers_BCBS _sbfrm].Requery
End Sub

The problem:
When I open the main form (frmProviderMai n) I get a message box to ENTER PARAMETER VALUE . . . .which contains text from query above . . ."[Forms]![frmProviderMain]![frmNumbers_BCBS List].[Form].[ProviderID]"

I appreciate any help. My head is getting kind of sore from beating it against the wall!