Pre-calculation check for duplicate line items

Pre-calculation check for duplicate line items

I am sure the acute pain felt when locking-up the model for simply creating a duplicate line item is felt by many model builders. 

 

Please could we have a simple check (this already happens elsewhere in the model e.g. actions) that ensures there are no duplicate line items before the model is calculated/refreshed?

 

It only hangs the model for a short while but it is seriously irritating. 

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