Your flow: Purchase - Receive - Bill is wrong. My vendors ALL require:
Purchase - Bill - Pay - Ship - Receive.
They will NOT ship until I've paid.
If I use the flow:
Purchase - Bill - Pay in Zoho Inventory, I cannot do the Receive step!
If I do your flow, Purchase - Receive - Bill, sales tax and shipping do not show up on the Receive screen, but they also don't show up on the Bill! Your flow is awkward because it generates two bills: one for the items, and one for tax & shipping! This is wrong because it is awkward and confusing for me and for my vendors!