Hi Rohan
From your trace, looks like the RFC connection is having some problem
Caused by: com.sap.aii.adapter.rfc.afcommunication.RfcAFWException: error while processing message to remote system:com.sap.aii.adapter.rfc.core.client.RfcClientException: resource error: could not get a client from JCO.Pool: com.sap.mw.jco.JCO$Exception: (106) JCO_ERROR_RESOURCE: Connection pool RfcClient[RFCLookUpGLTransactionsData]c63e54cc41083352af06556d6dd4d9d4 is exhausted. The current pool size limit (max connections) is 1 connections.
at com.sap.aii.adapter.rfc.afcommunication.from.FromAF.callClientChannel(FromAF.java:229)
at com.sap.aii.adapter.rfc.afcommunication.ejb.RfcAFBean.process(RfcAFBean.java:270)
Can you check your RFC receiver comm channel?
Rgds
Eng Swee