Hi chandrashekar,
Hope you are doing good.
Review the following Notes for how the engine behaves when multiple spool workprocesses are configured:
note 118057 - Flexible Configuration of the Spool Service
note 108799 - How many spool work processes for each instance?
Are you certain that the "rdisp/wp_no_spo_Fro_max" parameter was set correctly.
Thank you!
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Kind Regards,
Hemanth
SAP AGS