What's classes for create Fixed Asset from Purchase Order ?

Hi all..

i try for create PO. And then, in Lines details --> tab FixedAsset, i tick 'New fixed asset?'.

and then, i post packing slip.

So, fixed asset number is created, and i can check fixed asset number in modul Fixed Asset.

my question is, what classes for create Fixed Asset from Purchase Order.

Because, i have one field in PurchLine, this field is PIL_Description_PO.

and then, i have one field again in table AssetTable, this field PIL_Description_Asset.

i want, if i post packing slip, field PIL_Description_Asset in table AssetTable based on field PIL_Description_PO in table PurchLine.

Please help me.

Thanks.