Shipment was not fully allocated - The Unit Conversion from LB to CS does not exist for item - D365FO

Hi,

Issue:  

Shipment was not fully allocated
The Unit Conversion from LB to CS does not exist for item 

Findings: While releasing item from sales order user getting above error

Reservation happened in  batch number which is non fixed location of an item. 

Solution: Please remove reservation and advice user to move stock to Item's Fixed Location. Process further as normal.