Help Required to post IDOC from R/3 to XI

Question

Hello,
I need help to post IDOC from R/3 to XI
My XI System --- E11 on client 001
My R/3 System -- IXS on client 812
In R/3
1. I use Tx SM59 to make RFC Dest --- E11CLNT001  (Client will be 001 Pointing to my XI System )
2. I use TX WE21 to make Port -- A00020  which is using above RFC Dest
3. I use TX WE20 to make Partner Profile -- RECE ( IDOC Outbound Parameter-  MATMAS which is using above Port)
In XI
1. I use TX SM59 to make RFC Dest --- E11812 (Client will be 812 Pointing to my R/3 System )
2. I use TX IDX1 to make Port --- SAPB6M (Client will be 812 and RFC Dest -- E11812 )
3. I use TX WE20 to make Partner Profile  -- B6MTEST  ( IDOC Inboubnd Parameter-  MATMAS )
While Posting data from R/3
Recipient Port --- A00020 
Recipient Partner No -- RECE
Recipient Partner Type --- LS
Sender Port --- SAPB6M
Sender  Partner Number  -- B6MTEST 
Sender  Partner Type --- LS
I am getting error " Could not post IDOC to R/3".
Please let me know where are my setting are incorrect
Regards

Answer 1

In R/3
1. I use Tx SM59 to make RFC Dest --- E11CLNT001 (Client will be 001 Pointing to my XI System )
2. I use TX WE21 to make Port -- A00020 which is using above RFC Dest ( THIS PORT NAME SHOULD BE IN THE FORMAT SAPSID, A00020 (is it you SAPSID, else it will throw error)
3. I use TX WE20 to make Partner Profile -- RECE ( IDOC Outbound Parameter- MATMAS which is using above Port)
In XI
1. I use TX SM59 to make RFC Dest --- E11812 (Client will be 812 Pointing to my R/3 System )
2. I use TX IDX1 to make Port --- SAPB6M (Client will be 812 and RFC Dest -- E11812 )  ( THIS PORT NAME SHOULD BE IN THE FORMAT SAPSID, A00020 (is it you SAPSID, else it will throw error)
3. I use TX WE20 to make Partner Profile -- B6MTEST ( IDOC Inboubnd Parameter- MATMAS ) ( Not require in SAP XI)
chenage the PORT NAME IN R/3 it should work.