Form Subform reference issue

I have this in the control source of a field on a form:

=DSum("[ShipQty]","tblShipmentDetails","[ReadyID] = " & [Forms]![subfrmReady]![txtReadyID])

But it doesn't work and I think the reason is because I have to somehow reference the main form prior to the    [Forms]![subfrmReady]![txtReadyID]  part of the line.

??
SteveL13Asked:
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Rey Obrero (Capricorn1)Commented:
try this

=DSum("[ShipQty]","tblShipmentDetails","[ReadyID] = " & [Forms]![Name Of MAIN Form][subfrmReady].Form![txtReadyID])


change "Name Of MAIN Form" with the actual name of the main form

if that does not work,

change "subfrmReady" with the name of the control that house the subform
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PatHartmanCommented:
A form only has one current record.  When you reference a subform from it's parent form or some other form, the ONLY record you can reference this way is the FIRST record in the subform's RecordSource.  Is that your intention?  Or is that what you think is wrong?

Tell us what you are trying to sum and we can offer another suggestion.  

A simple way to get a total for the subform's RecordSource is to add controls to the footer of the subform - they don't need to be visible.
=Sum(fld1)

Then in the main form, you have a control that references the control in the subform's footer.
= sfrmYoursubform.Form!txtSumOfFld1
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