In SAP Integrated Business Planning (IBP), a compound master data type is one whose primary key is composed of the primary keys of two or more other master data types.

SOURCECUSTOMER (B) is a compound master data type that defines the sourcing relationship for a customer. Its key is typically composed of PRODUCTID and CUSTOMERID, linking the Product and Customer master data types.

SOURCELOCATION (C) is a compound master data type that defines a transportation lane for a product between a source location (LOCATIONFRID) and a destination location (LOCATIONID). Its key is composed of PRODUCTID, LOCATIONID, and LOCATIONFRID, linking the Product and Location master data types.

Both are fundamental for defining the supply network and material flows in supply and inventory planning.

A. SOURCEPRODUCTION: While technically a compound master data type (key: PRODUCTID, LOCATIONID), it primarily defines an internal production process at a single location rather than a sourcing relationship between two distinct entities (like two locations or a location and a customer).

D. SOURCECUSTGROUP: This is a compound master data type (key: PRODUCTID, CUSTGROUPID) but represents an aggregated sourcing rule. SOURCECUSTOMER is the more granular and common master data type for defining specific customer sourcing lanes.

1. SAP Help Portal

SAP Integrated Business Planning for Supply Chain

Model Configuration Guide

"Master Data Types" section. This guide defines a compound master data type as being composed of two or more other master data types. It states

"The key of the compound master data type is composed of the keys of its component master data types."

2. SAP Help Portal

SAP Integrated Business Planning for Supply Chain

Model Configuration Guide

"Sample Planning Areas" -> "Master Data Types in SAPIBP1". This section describes the standard master data types used in the unified planning area.

It explicitly lists SOURCELOCATION as a compound master data type with components LOCATION (as LOCFR and LOCTO) and PRODUCT.

It explicitly lists SOURCECUSTOMER as a compound master data type with components CUSTOMER and PRODUCT.

These two master data types are presented as the primary means of defining the supply network for transportation sourcing.