import goods related query

Good morning all,

We have imported goods from china and we got invoice in dollar without tax. Then we paid igst in BOE ( bill of entry).

So my question is that do we need to pay RCM against china invoice because we have already paid tax in BOE for same invoice and how can we claim for IGST that we paid.

Kindly tell me how to treat tax here🙏🙏🙏

Regards