EBS 12.1.3 oracle forms trace file

Hi

Any idea why this code 'FND_SIGNON.SET_SESSION' is called from one responsibility and not another responsibility when trying to submit the same concurrent request?

Thanks.

RPC CALL:PROCEDURE APPS.FND_SIGNON.SET_SESSION(SESSION_DATE IN VARCHAR2);

RPC BINDS:

bind 0: dty=1 bfp=ffffffff78b27ff8 flg=0a avl=00 mxl=32767 val=""

=====================

PARSING IN CURSOR #18446744071441353912 len=190 dep=1 uid=173 oct=2 lid=173 tim=18596637954903 hv=1791910143 ad='d87ad4b48' sqlid='gnwud15pcws7z'

INSERT INTO FND_SESSIONS ( SESSION_ID, EFFECTIVE_DATE) SELECT USERENV('SESSIONID'), :B1 FROM SYS.DUAL WHERE NOT EXISTS (SELECT NULL FROM FND_SESSIONS WHERE SESSION_ID = USERENV('SESSIONID'))