Add comparator for customer.
Allow delivery of goods from main warehouse for purchases from another region.
Add more informative  error message in inventory transfers.
Set versions to 0.6
Guards for null.
Display ready stocks for main warehouse in Product screen.
Disable add new product in Transfer screen.
Change invoices formatting.
Add feature to refresh the number of ordered items that is not delivered yet in Product screen.
Set versions to 0.6.1
Fixes searching errror in Bonus Point screen.
Changes column caption for invoices.
Fixes product search was not working.
Fixes product update was not working.
Changes number of delivery pending quantities to read-only in Product screen.
Set versions to 0.6.2
Fixes multi users concurrency bug that overrides product's quantity when creating new sales invoices.
Add feature to refresh product's quantity.
Set versions to 0.7
Allow deleting invoices from outside of major sales area.