Flexible Multiple Payment Terms

Question

Hi SAP Gurus,
Is there any option to include multiple flexible payment terms in a PO?
By flexible, I mean, users shall have the to write in fields either the % or the value and the desctiption of payment terms, instead of selecting Z102, Z103, etc. which are already available (by creating and assigning installment payments in FI in advance). And later to appear in PO printout, unlike Discounts on net, Packaging, etc. in Condition Types where either the % or the value can be entered by users and where those Condition Types either substract or add to the PO value. But in this situation, neither the % nor the value nor the description of payment terms remain same for the same or other vendor.
For example, Z102-' 20% against drawing approval ' in a PO may not remain same for the same or other vendor in another PO and it may be '10% against submission of drawings'. Similarly Z103-'20% against shipping documents', etc. 
Any help is appreciated.
Thanks in advance.
Regards,

Answer 1

I have a similar issue.  PO set up for one large item, pay 30% upon order, so Due Upon Receipt and the balance owing is at  NET 30, so 2 different sets of terms.
The vendor master carries the Terms over to the PO, however the PO terms can be changed and once changed these override the normal vendor master terms. 
So on first PO for Product A - you specify terms as being Net 20
On 2nd PO for Product B - you can let the vendor terms come over Net 30
For you this will work as long as your vendor is able to split the invoices by product which they should do.
ON the MIRO side, for each invoice posted the terms can also be changed so if it was missed when doing the PO it can be corrected at IR.  If your system is set for checking duplicate invoices and you have to put a combined product invoice into MIRO then you will have to alter the Reference field invoice number on the 2nd invoice.  IE Inv#123-A  & Inv#123-B  etc.  But you are best getting your vendor to invoice you by product.