free text field on the PO to inform accounting dept while doing MIRO

Hi Gurus,

Is there a free text field on the PO which gets copied over to the MIRO? or any other method that can achieve this. The requirement is we buy certain capital equipment from the vendor and we want to put a flag somewhere on the PO saying that whenever the invoice comes also make sure to check for additional documetnation, so that whenver the accounting enters the invoice in MIRO they will know to chek for this documenation. so the bottom line is accounting should know some way or the other in MIRO trasnaction. This is not vendor specific. whenever we but the capital equipment worth 10,000 USD or more we need to have this docuemtnation from whomever we buy. This is going to be for account assignment category F (internal order)

Thanks

Anusha