how to activate a stored procedure to create a receive message

This is my second BizTalk project.  This project should

step1: receive a flat file and insert/update a table in SQL server A

step2: revoke a stored procedure in another SQL server B to get a set of data in xml format using “for xml auto”

step3: use the xml data from step 2 to update the table in step 1

This is what I have done:

1. create projectSchema 1 to create schemaFlatFile, schemaInsert, pipeline, map needed for step 1
2. create projectSchema 2 to create schemaReceiveUpdateData,schemaSendUpdateData, map needed for step 2 and 3
3. create projectOrchestration:it includes 4 messages: messageFlatFile, messageInsert, messageReceiveUpdate, messageSendUpdate. 4 ports: PortReceiveFlatFile, PortSendInsert, PortReceiveUpdate, PortSendUpdate.

I know something is wrong with messageReceiveUpdate.  I get different error when select True or False for Activate.  I don’t know how it should be done to invoke the ReceiveUpdateData stored procedure to create the messageReceiveUpdate.

Your help will be highly appreciated.

Lynn