SAP ＭＭ 采购定价中为什么有些条件类型可以指定一个Vendor Code,有些却不能？

PO number 8500010071

1>Add condition type ZD01,

Select ZD01 condition record and click ‘Condition detail’ button, we gotbelow screen shot:

Cannot specify a vendor code for this surcharge.

2>We add condition type ZSU2,

We check condition details for it,

We can specify a vendor code for this condition type in the PO.

Why?

3> Check the pricing procedure of this PO, ZM1000,

The ZD01 in this procedure,

The ZSU2 in this procedure,

If the checkbox ‘Accruals’ was selected in the configuration of condition type, then we can specify a vendor code in the condition record of purchase order document.