Initial commit: Core packages

odoo-bringout-oca-ocb-purchase_requisition/doc/MODELS.md

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+# Models
+
+Detected core models and extensions in purchase_requisition.
+
+```mermaid
+classDiagram
+    class purchase_order_group
+    class purchase_requisition
+    class purchase_requisition_line
+    class purchase_requisition_type
+    class analytic_mixin
+    class product_product
+    class product_supplierinfo
+    class purchase_order
+    class purchase_order_line
+```
+
+Notes
+- Classes show model technical names; fields omitted for brevity.
+- Items listed under _inherit are extensions of existing models.