MiGo and Miro price difference

Dear Expert,

i have created the PO of 10 Quantity with 75 RS Each Price.and At the Migo i have received 10 Quantity reference of PO.when i am doing Miro then i am changing price 73 Rs.what will be process because i want to right financial entry.give me the solution with Financial entry.

my fin entry

at migo : RM Stock ac Dr 750Rs

To Gr/Ir Ac cr 750

at migo time when i m changing price 73 and i similate the docx

Gr/Ir Dr 750

To Vendor Cr 730

To Rm stock cr 20

this is wrong please give me right entry .

Thanks in advance

Sarvottam