To close the unclosed production orders without imbalancing with invoice

Hi MRP Experts,

I want solution for following situation.

Mrp was not implemeted during software implementation.

Now we need to implement.

But since manual production entry was not done according to invoice there is no link between them.

At present i have unclosed production orders which was actually manually closed and at present if i try to close it it might show imbalance during the mrp implementation with respect to mismatch in date.

Please give me some suggestions to close the unclosed production orders without imbalancing

Thanks and regards,

Tejaswini