This wiki page discusses the second BDOC PRDCT_OBJECT which is generated after change is made on CRM:

Unlike PRODUCT_MAT, this BDOC is handled asynchronously:

Three registered services are called one by one within the loop:

The first function module, /1CRMGC/PRDCT_OBJECT_CDB, is generated automatically by tool and responsible for CDB synchronization:

Since all of these three function modules do not have any recipients determined, this second BDOC has actually no receivers. No data transfer exists.
Here below is actual data contained in this BDOC:

本文来自云栖社区合作伙伴“汪子熙”，了解相关信息可以关注微信公众号"汪子熙"。