Not able to claim Modvat for expense item in 12.1.3

Hi

I have a query on claiming MODVAT on expense item

1. Create a purchase order for an expense item and attached recoverable excise basic tax and approve

2. while doing receipt modvat not claimed

3. It is not showing in Claim Modvat forms also

4. Inv org additional info defined as excise org, sub inventory bonded setup is there and supplier additional info is also available for the site

5. Item excise classification provided as Modvatable Y, Excisable Y and RMIN

6. Register preference PLA- 1, RG23A-2 and RG23C as 3. Negative balances allowed in PLA and Negative quantity balance allowed in RG registers as well