i purchase product from unregistered dealers .so i have no inputs.now i want to register in gst.if i opt for composition scheme will registered dealers have any issue for purchasing from me?
No issue , Composition Dealer will be issue Bill of supply to registered dealer , No question of Input Tax credit for registered Dealer , But he has show in GSTR 1 and GSTR3B .
On your sales you will not be charging GST from buyer and therefore they will not have any ITC. You will have to pay GST from your own pocket. AS such the buyer won't be having any issue.