(Error 3022)The Changes You.... Error In Subform

hi guys i was wondering if you can help me this is my code: i have a main form with this code, this form contains a subform linked by the All_PricingID

Set rst = CurrentDb.OpenRecordset("tblAll_Pricing") 'main table
' adding data to the table
rst.AddNew
' Main table
rst!All_PricingID = Me.txtPricingID 'Main table pk
rst!MainContract_ID = Me.cmbMainContract 'combo box in parent form
rst!ItemNumber = Me.txtItem 'Main form text
rst.Update

'sub Table
Set rst2 = CurrentDb.OpenRecordset("tblPricing") 'sub table
For varItem = 0 To Me.lstsubContracts.ListCount - 1 'this is a list in the main form
'--- loop through all the items in the list box and create a new row in the subform for each subcontract in the listbox lstSubcontracts.
rst2.AddNew
rst2!ID = Me.All_PricingID 'sub table foreign key
rst2!SubContractID = Me.lstsubContracts.Column(0, varItem) 'sub table
rst2.Update
Next varItem
'--- close the tables
rst.Close
rst2.Close
Set rst = Nothing
Set rst2 = Nothing


the subform appears correctly with the rows i wanted added but i need the user to be able to edit a column in the subform for the rows just created (my form is on datasheet view). but everytime i move to cursor into the subform, i can't even scroll up and down.

i keep getting an error that says :

The changes you requested to the table were not successful because they would create duplicate values in the index, primary key, or relationship. (Error 3022)


but when i check my tables tblAll_Pricing and tblPricing , everything is inserted correctly according to my recorset above, do you know why this is happening? and why i am not able to edit my subform. my subform allowsedits and additions.


help!!