Lot Number automatically committed upon processing Item Receipt.

User enabled Multi-Location Inventory feature. They entered Purchase Order for Lot Numbered Inventory Item.  Upon processing Item Receipt, Lot Number is automatically committed.

Here are the recommended troubleshooting steps:
1.  Pull up the Item Record > Purchasing/Inventory tab > Inventory Numbers sub tab > click on the Lot Number
2. Notice that it has Serial/ Lot Number Status = Committed
3. Click Search Transactions button
4.  No Sales Order was entered for the Lot Number

Check Location in Setup > Company > Locations. Click View on the Location and notice that Make Inventory Available is unchecked.  Edit the Location setup and mark/enable Make Inventory Available checkbox then click Save.  

Go back to the Item Record and it is expected that the Lot Number status is now Available.