Inventory Create reservation API error "Quantity not available to reserve" though on-hand quantity a

We have a program which receives quantity using receiving transaction processor. Than a query checks if on-hand quantity available. After positive confirmation of query, program submits create reservation API. Randomly in some cases create reservation API is giving error message "Quantity not available to reserve". We can see quantity availability by SQL query. Also system allows to reserve if person manually reserve the inventory quantity. Manually reserving might take 1-3 minutes. Is it something timing issue? Appreciate any help/suggestions to fix this error.