There is no standard download object for reason for rejections configuration (Table TVAG in ECC) from ECC to CRM. One need to configure the same in both the systems.
There are some difference which are listed below which could be the reason why SAP has not provided standard download object.
If you look at configuration in CRM there are some fields in configuration such as 'item to be deleted' which are different from ECC and in ECC there are many other options such as BIC, Stat etc in addition to this 00 - Assigned by the System (Internal) which deletes the line item as a standard setting.
if required ( i dont see any reson) one can create a new download object and map the fields.
you can check this thred also