RSA1:Entry in inbound table already exists

While execute transaction RSA1

Message Error follows
Entry in inbound table already exists
Message no. E0412

Inbound parameters already exist in the partner profile under the
following key:

/DBW100/LS//RSSEND////

This relates to the key fields in table EDP21:

SNDPRN  Partner number
SNDPRT  Partner type
SNDPFC  Partner function
MESTYP  Message type
MESCOD  Message code
MESFCT  Message function
TEST    Test indicator

Solution:

This issue uses to be really related to the self system. The system is created the first time you call the AWB (RSA1). Because of this, the system tries to create entries in certain tables (e.g. table
EDP21) but if there were already entries concerning the partner profile, this results in errors such as E0412.

Delete the entries for RSSEND and RSINFO in table EDP21 and the entries for RSRQST in table EDP13 related to RWD300. You have to delete just the entries with the same name as the BW system
itself.

When the entries are cleared, only calling the AWB again via RSA1 should create all entries for the self system correctly and in the right order.