Hi Ramana,
First do you use automatic approval for RFx?
Then does this issue only happen to one RFx? Can this be reproduced for new RFX?
If this can't be reproduced, I can only suggest you manually approve it with trx swo1.
Meanwhile if automatic approval is used, you should also check if event linkage is activated for the following event with trx swe2:
/SAPSRM/CL_WF_PDO READY_FOR_RELEASE SRM_PROCESS_START
/SAPSRM/CL_WF_PDO READY_FOR_WORKFLOW WS40000014
Best regards,
Ivy