SAP CRM Relationship API设计原理
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 IT_LINK_IDENTS sourceguid or destiguid contains product guid. This will be used by the generic read API to