[A] This may happen if the "Type" of the counterparty does not match the document you want to create. For example, if you are creating a purchase order and the type of counterparty is a buyer that means you can only create sales document for that counterparty.
[B] To change the counterparty type, go to the Network module.
[C} In the search bar on the right side, search the name of the party for which the type is to be edited. Click on the Edit button next to it.
[D} Now next to the Name, click on Type. Select the type from the drop-down list suitable to that counter party.
[E} Click on Save Details. The type has been changed.
Keywords: buyer, seller, both, type of counterparty, counterparty not showing