Rule Bases Check and CTP Settings

Question

Dear Experts,
   I want to run Rule based ATP and CTP together in the system. As far as i know the system of each of these are typicAl and i am not able to run both together. Please guide me for any settings to be maintained to run the same.
Thanks

Answer 1

Prashant,
First, make sure RBA works, and CTP works, independently.  I won't go into setup for each of these, which are pretty extensive all on their own.
I don't know what you are using for rules, so I will give you some general ideas.  You will have to decide how you want it to work.  For RBA & CTP, it usually makes most sense to run RBA immediately, and when none of the RBA proposals give a solution, then you execute production (CTP).  If you were to invoke production first, you will typically find a solution immediately and never get to the RBA step.  The trick is to have RBA call production on the last step of the last rule.
So, in IMG>APO>GATP>General Settings>Maintain Check instructions do product check first (well, unless you are doing allocation, but that is another story).  Tick Activate RBA, start immediately.  This gets RBA running first.  It will do all the product checks you have configured in your RBA.  Set the Production part as 'Availability check only, no production'.  A bit counter-intuitive sounding, thanks SAP!
Logically, the final rule you determine (after failure of all previous rules) will be a location determination rule,  where the system decides where you are going to manufacture the parts. (you should already have determined product and version).  On the final location determination rule, you assign a location determination activity (which you defined in /SAPAPO/RBA04>Profiles and Parameters>Location determination activities).  Within the Location determination activity, you invoke production. Within the activity, you define Start Production as  'Availability check first, then production', on the assumption that you haven't checked this location yet for standard product check.
This is one way to use both RBA and CTP.  There are probably others, but I have used this successfully.
Rgds,
DB49