APO GATP :  Unable to call APO during ATP check

Question: While creating Sales order in ECC, ATP check in performed in ECC rather than in APO (GATP). Not sure where the issue is.
1. RFC connectivity exisit between ECC and APO server -- Checked
2. Integration model active with ATP flag checked and also ATP customization flag active 
Note: The entries in  MARC table (field APOKZ)  for GATP relevant material shows a value of '3' .  I guess it should be either 1 or 2.   I am not sure what makes it a value of 1 or 2.
Appreciate your help.

Katrat,
I will assume that you have never attempted ATP in APO on this ERP/SCM pair of systems.
There are so many things that must be set up properly to first turn on ATP, the answer is not really suitable for a forum post.  I suggest you follow the Best Practices step by step.  When I have followed these steps, I have never been unsuccessful in establishing an initial ATP.
[Connectivity|http://help.sap.com/bp_scmv250/BBLibrary/Documentation/B02_BB_ConfigGuide_EN_DE.doc] (you probably don't need this one, since you say you have already tested your connection successfully)
[Replication|http://help.sap.com/bp_scmv250/BBLibrary/Documentation/B05_BB_ConfigGuide_EN_DE.doc]
[Global ATP|http://help.sap.com/bp_scmv250/BBLibrary/Documentation/ATP_BB_ConfigGuide_EN_DE.doc]
The above will get you to the point of a basic product check in SCM, with the option of RulesBasedAvailability check.  I suggest you ignore RBA until you have established a successful basic product check.
Regards,
DB49

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