purchased goods before June 30 under CST bill goods arrived in July month does shall i claim input tax credit under Gst

As per my opinion,Tax paid on central purchases before 01.07.2017 will not be allowed as input tax credit under IGST Credit because credit is allowed only Only if it is shown as closing balance of credit in last respective cst return Since earlier in CST there is no concept of CST input credit Therefore igst credit allowed only in respect of interstate purchases made on or after July first