i have custom Module to import inventory operations . 

when i import the excel sheet and make mark as done - Check Availability - Validate odoo give me odoo server error  

You cannot validate a transfer if no quantities are reserved nor done. To force the transfer, switch in edit more and encode the done quantities. 

also another message when i make unreserved  It is not possible to unreserved more products of  than you have in stock.

How can I solve this ?

Any help or answer is appreciable.
Thanks,