I checked during the runs and there were no enqueue locks on the database although when using the racdiag.sql script I got the following detail:

WAITING SESSIONS:

INST_ID SID STATE EVENT SECONDS P1 P2 P3 LAST_SQL
---------- ---------- ------- ------------------------- ---------- ---------- -------
--- ---------- ----------------------------------------
2 37 WAITING queue messages 8 311453 2597698332 10 BEGI
N FND_CP_GSM_IPC.Get_Message(:1,:2,:
2 59 WAITING queue messages 4 243944 2597714652 10 BEGIN WF_EVENT_OJMSTEXT
_QH.DEQUEUE(:1, :
1 64 WAITING enqueue 1 1431044102 1073784457 0 declare v_ret number := 0; begin

GES LOCK WAITERS:

INST_ID SID SPID RESOURCE_NAME1 GRANT_LEVEL REQUEST_LEVEL STATE
SID EVENT SEC
------- ----- ------------ ------------------------------ -------------------------------- ---------------------------
----- ---------------- ----- ------------------------------ -----
3 93 30223 [0x4000a689][0x0],[UL] Null Exc
lusive 93 SQL*Net message from client
8
3 111 30225 [0x4000a689][0x0],[UL] Null Exclusive 111 SQL
*Net message from client 8
3 107 30230 [0x4000a689][0x0],[UL] Null Exclusive
107 SQL*Net message from client 7
3 61 30223 [0x4000a689][0x0],[UL] Null Exclusive
61 enqueue
1
3 101 30225 [0x4000a689][0x0],[UL] Null Exclusive 101 enqueue
1
3 112 30230 [0x4000a689][0x0],[UL] Null Exclusive
112 enqueue 1



GES LOCK BLOCKERS:

INST_ID SID SPID RESOURCE_NAME1 GRANT_LEVEL
REQUEST_LEVEL STATE SID EVENT
SEC
------- ----- ------------ ------------------------------ -------------------------------- -------------------------------- ---------------- --
--- ------------------------------ -----
2 102 26687 [0x4000a689][0x0],[UL] Exclusive Exclusive
102 SQL*Net message from client 8
2 155 26687 [0x4000a689][0x0],[UL] Exclusive Excl
usive 155 lock escalate retry
0