Changing Product Numbers in Product List

Changing Product Numbers in Product List

I have a project with approximately 45 rooms. I am processing the rooms to get material quantities and I have 2 different Specification Groups. When I change the spec groups, quantities and product numbers to process, I get an error message when I change the product numbers.. I have attached a capture below. The numbers will change on the screen, but if I switch to another room and back to the original room, the cabinet numbers have reverted to the original. Any ideas why this happens?

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