Gta under rcm u/s 9(3)

As I understand, RCM is applicable in case of GTA. Hence, recipient is liable to pay GST. With regard to availing credit of input tax credit on such payments by recipient, it depends on nature of goods transported. Refer for details: https://cleartax.in/s/goods-transport-agency-under-gst

agreed !!

but if the gst paid by the supplier under RCM so what will be the consequences ??

If supplier pays GST under RCM, then he shall be treated as the recipient who in turn will be eligible to avail input tax credit.