There is a PO for one particular model which is in R/3 and is not getting transferred to APO. I checked CPP/CCR, tried to push the PO to APO,its giving error which does not tell anything.
Also checked CCR, it gives the error code:181
Schedule line does not exist in APO
Message no. /SAPAPO/CIF181
Also, this model exists in active integration model, and the Queue is not blocked.