The following query lets you see all assets for a given PO number. Notice the WHERE clause at the end where you can substitute a parameter to allow you to specify a PO Number at runtime.
/*List PO, Receiving Slip Number and the Assets that where created when */
/* using the receiving process. Software items are not reported in this report. */
select j.name as 'PO Number', j.Description, i.name as 'Receiving Slip',
k.name as 'Asset', va.[Serial Number], va.[Asset Type], va.*
/* For more details on the POs and receiving slips, remove the two dashes at the beginning of the next line */
--, rec.*, li.*, i.*, k.*, j.*
from inv_parent_lines rec
join item i on rec.[_resourceguid] = i.[guid]-- Receiving slip
join Inv_Line_Items li
on rec.[parent line item id]=li.[line item id] -- PO
join item j on li.[_resourceguid] = j.guid
join vReceivingSlipAssoResource rs
on i.guid = rs.parentresourceguid
join item k on k.guid = rs.childresourceguid -- Asset
join vAsset va on rs...