Practically, the Individual Material option is not available as an Account Assignment in a Down Payment Request.
This is not the way to create a Fixed Asset from a Down Payment.
Reproducing the Issue
You created a down payment request
You selected the product type : material.
Yet, the account assignment type Individual Material is not present in the value help
Therefore it is not possible to create the Fixed Asset from the Down Payment.
It is not allowed to raise a Down Payment against an IMat since a Fixed Asset cannot be created out of a Down Payment.
Here are the steps to create a fixed asset from procurement process while using Down Payment:
a) Create a Purchase Order against the Supplier. While creating the PO, Account Assignment can be made against a Cost Center. The PO Item can be converted into an IMat by clicking on the New Individual Material button.
b) Create a Down Payment in the system by giving the PO Reference. The Account Assignment should be the same as in the PO.
c) Create a Goods & Services Receipt for the PO which was created once the goods are received. This will result in creation of the Fixed Asset
d) Make the payment for the Down Payment
e) Create a Supplier Invoice & include this Down Payment in it.
f) If the Down Payment is less than the amount of the Supplier Invoice, make the payment for the difference
g) Execute a GR/IR Clearing Run
KBA , SRD-CC , Cross Components , How To