MRP resulting in multiple requisitions for same material

Hi,

I´m having some difficulties with MRP for my client.

I have set up lot size as MB for monthly.

I am expecting one requisition for one material, however when it runs it creates three.

Can someone explain to me where that is controlled and with what criterias?

I am also after knowing how to group multiple requisitions for same material into one line on the PO.

When running the ME59N it creates one line per requisition, however im sure it should be possible to group into one line on the PO?

Really appreciate any help.