Control Record Fields of the IDoc Adapter (AAE)

• SNDPOR - Should be SAP<SID>. If your PO Server has SID  "POD", then SAPPOD
• RCVPOR - Should be SAP<SID>, If your ECC Server has SID "ECD", then SAPECD.
• Your Receiver Business System and Sender Business System are the same? Atleast your screen shot is the same.
• In your IDoc Receiver Channel, as you have selected Control Record in IDoc XML as Mandatory, make sure all these fields described in this link are set are required, The Control Record Fields of the IDoc Adapter (AAE) - Advanced Adapter Engine - SAP Library

Field Name	Description
MANDT	Client
SNDPOR	Sender port The following valueas are possible: port = SAP+System_ID  If the value of the SNDPRT field is not LS, MANDT and SNDPRT determine sender service. port <> SAP+System_ID  If the value of the SNDPRT field is not LS, the field directly determines sender service.
SNDPRN	Sender partner number
SNDPRT	Sender partner type. The possible options for this field are: Logical system (LS)  Customer (KU)  Vendor (LI)  User(US)
SNDPFC	Sender partner function (optional field)
RCVPOR	Receiver Port
RCVPRN	Receiver partner number
RCVPRT	Receiver partner type. The possible options for this field are: Logical system (LS)  Customer (KU)  Vendor (LI)  User(US)
RCVPFC	Receiver partner function (optional field)
MSGTYP	Message type
IDOCTYP	Idoc type
CIMTYP	CIM type