/// <summary>
/// Allocate Costs.
/// Done at Invoice Line Level
/// </summary>
/// <returns>error message or ""</returns>
public String AllocateCosts()
{
MInvoiceLine il = new MInvoiceLine(GetCtx(), GetC_InvoiceLine_ID(), Get_TrxName());
return(il.AllocateLandedCosts());
}
