Unlike settype, relationship does not have a dedicated read function module maintained in its metadata table. Instead, the generic read function module COM_IL_DB_READ is used.

Below is a simple explanation about each parameter of FM COM_IL_DB_READ, using read on relationship PRDCPN for example.

IV_RELTYPE

PRDCPN - relationship name

IV_ATTR_TYPE

COMT_IL_PRDCPN_ATTR_TYPE - contains relationship specific business data, in this example, the customer product id is stored in field PRID_VENDOR