Hi Fahis,
Landed Cost is a expenses from another Vendor, and you want to allocation to the Value of Item. So system record Credit on Landed Cost Allocation Account.
Inventory Acct => Dr
Lanede Cost Allocation Acct => Cr
After that, you need create a AP Invoice (service) for a Vendor.
Landed Cost Allocation Acct => Dr
Vendor => Cr
GBU