gATP allocation in STO

Hi,

I am trying to design gATP allocation for STO. Currently I am facing 2 issues.

1. Entire setting has been done. All the necessary steps are also performed in the APO system. But when I am performing avaialbiilty check in the STO [ME21N], system is performing the avaialvility check. But allocation is not carried out. If I go further to check then I could see that except product allocation object, rest of the characteristics have 'wild card' or 'generic' values, even though I have maintained all the characteristcs values in the planning book. These values are appearing correctly in /SAPAPO/AC42. Can anybody help me to know, why system is reading generic values?

2. I am trying to add field 'WERKS_TO' [receiving plant] in the field catalog. But it is not available in the Field Catalog repository. Can anyone help me to get this Standard SAP field into field catalog? It has been mentioned in the SAP help. Link is mentioned below.

https://help.sap.com/saphelp_snc70/helpdata/en/27/31f938a1914358a9df1fcdc2b454ae/content.htm?no_cache=true

Thanks & Regards

Piyush Ranpura