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Allow Additions = No prevents data being displayed properly

Allow Additions = No prevents data being displayed properly

(OP)
I have a Customers form with a subform for completed orders.

Picking an order and clicking an Orders button opens an Order Details form that shows the order’s Products and Credits in separate subforms.

I want to prevent a user from accidentally changing the details so have set each subform’s Data properties to Allow Additions = No, same for Allow Deletions and Allow Edits. The Order Details display properly for orders that contain entries in Products and Credits but if either doesn’t I get errors in the calculation fields below, which pull data from the OrderSubtotal and CreditTotal summations in the footers of each subform, ie

= [sfmOrderDetailsSubform].[Form].[OrderSubtotal]
= [sfmCreditAmounts].[Form].[CreditTotal]

This is stopping the next step of allowing additions etc if it’s essential to make changes.

So the question is how to extract details from the subforms when their data properties have been set to not allow additions, deletions and edits.

RE: Allow Additions = No prevents data being displayed properly

(OP)
I have resolved this by adding an On Load event to each subform in Order Details to check if there is any data to display and to set the data properties accordingly.

This leaves a possible scenario where any of the three subforms that ends up allowing additions, deletions or edits might lead to accidental changes to existing orders but that's as close as I can get.

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