Assigning Internal Order to Purchase Requisition without Account Assignment Order

How to assign an internal order to purchase requisition?

I just learned today that there were 2 solutions for this :

1. Assigning the IO directly to PR using account assignment F (order)
2. Assigning the Asset to PR, if the IO already assigned to the Asset beforehand, IO number shall appear automatically.

However i learned that to make option 2 applicable, a statistical cost element needed to be assigned to asset gl account. Why statistical? Because Asset GL Account is a Balance Sheet account, thus actually not to be assigned to a cost element. Note the basic thing in CO module that a cost element is needed for P/L account and not B/S account.

I look over this problems for 3 days already and cannot resolve it. A friend of mine solved it in less than 6 hours :D Lol. I need to study more :) Go Choco Go!

Tcodes to be use to solve this (with the assumption that all customizing has already done for FI, CO and MM) :

FS00 - Edit GL account, check wether the GL account already assigned to a cost element or not

KA01 - Create Primary Cost Element, noted that cost element category should be a statistical one. If there's none, create a new cost element category first.

K001 - Create Internal Order, if the internal order is only for budgeting purpose thus no need to be settled, choose the Statistical option when creating the IO on tab Control Data. If Commitment Updated was chosen, the IO can still be settled and may lead to a double posting on the asset and cost.

KO22 - Change budget. Use this tcode to maintain the budget in the IO.

ME21 or ME21N - Creating PR.