Changes in excise & tax rates after PO release

Hi Gurus,

We have the following scenario in our client :

i) all taxes, frieghts & excise gets inventorized during goods receipt. We can handle this either through condition types or through tax codes (non-deductable)

Issue is how to handle excise & tax rates changes after PO is released.

ii) Can this be handled outside CIN module because our client is a PSU and in utility sector and does not book any CENVAT/MODVAT credit

iii) is there any way to calculate LD (late delivery clause) based on condition type ?

Your valuable inputs is highly appreciated

Regards,

Sid