Resolve inventory business units and storage areas into sites, warehouses and storage dimensions, choose item model groups that reproduce source costing behaviour, and design the accrual and cost-of-goods-sold accounting the posting crosswalk depends on.
Inventory is where the honest limits of this source package become most visible, and it is better to say so at the start than to imply a precision the evidence does not support.
A PeopleSoft inventory business unit is a processing scope for stock, and estates use it to mean at least four different things.
The target expresses physical structure through three layers, and the split matters because each layer has different consequences.
Costing is the part of this module with the widest gap between what the source configuration says and what finance relies on, and the design has to be driven by the second.
The receipt accrual posting rule debits inventory or expense and credits a receipt accrual account, mapping to inventory posting purchase accrual configuration in the target with the accrual account coming from item-group setup.
The inventory issue rule debits cost of goods sold or usage expense and credits the inventory asset, mapping to inventory posting issue rules by item group, with the note to map item, business-unit and storage-area behaviour to site, warehouse and item-group decisions.
The lowest-risk part of this module is physical counting and adjustment. Counting journals and inventory adjustment journals in the target reproduce the source semantics closely, with account selection following the redesigned item groups rather than any source item-level configuration.
Inventory positions sit in the playbook's own wave sequence after products and reference data and before open receivables and payables, and the site model reflects the same ordering.
To be explicit about the boundary of the evidence, here is what this module cannot tell you about a specific estate.
Inventory is the module where the source package is most explicit about its own limits, and the design has to be built on estate evidence rather than on documented patterns alone.