1:n product interchangeability

Hi Gurus,

We the below interchangeability scenario in gATP :

Product 309 => Products (310 and 311)

Have maintained the below :

1. In /INCMD/UI have maintained suppression chain  - 309 =>(310 and 311) with replacement type 1:n - AND and 'valid from date' as 22.05.2015
2. Assigned the above to a product substitution procedure
3. Assigned the above product substitution procedure to a rule in /SAPAPO/RBA04 in tab 'prd + loc.subs (InC)'
4. Assigned the above created rule in rule determination in /SAPCND/AO11
5. No 'InC' selection in check instructions

When I create order for product 309 for 18.05.2015,product 309 is confirmed.

Rule assigned above is shown as selected in 'availability proposal screen'.Working well till here.

But when I create order for product 309 for 25.05.2015 (or any date beyond 22.05.2015),309 is neither confirmed nor replaced by (310 and 311).

Am I missing some setting ?

- Shankar