GST OCEAN FRIEGHT

Goods imported on fob basis, cha agent paid freight amount Rs. 180000 to foreign shipping agent, then cha agent issued invoice on rcm basis (CGST+SGST) to importer, then importer paid CGST Rs. 4500 and SGST Rs. 4500(5% on Rs.180000) to government and claimed on input on such amount
This treatment is correct?