fiscal area in the supplier information tab of the purchase order - acumatica

Question

Could you help me, I am changing the tax area code by adaptation, however the taxes are not updated, what am I missing or how can I change the related taxes when I change the tax area?
This is my code, through this event that I'm doing.
protected void POLine_SiteID_FieldUpdated(PXCache cache, PXFieldUpdatedEventArgs e)
{
var row = (POLine)e.Row;
var head = Base.Document.Current;
if (head == null) return;
if (row != null && row.OrderType == POOrderType.RegularOrder)
{
POLine line = PXSelect<POLine, Where<POLine.orderType,
Equal<Required<POLine.orderType>>,
And<POLine.orderNbr, Equal<Required<POLine.orderNbr>>>>>.Select(Base, row.OrderType, row.OrderNbr);
bool? xchange = false;
if (line != null)
{
INSite site = PXSelect<INSite, Where<INSite.siteID,
Equal<Required<INSite.siteID>>>>.Select(Base, line.SiteID);
if (site != null && line.SiteID == site.SiteID)
{
var ext = site.GetExtension<INSiteExt>();
if (ext != null)
{
head.TaxZoneID = ext.UsrTaxZone;
xchange = true;
}
}
if (xchange == true)
{
foreach (PEMclTaxZone zone in PXSelect<PEMclTaxZone,
Where<PEMclTaxZone.taxZoneID, Equal<Required<PEMclTaxZone.taxZoneID>>,
And<PEMclTaxZone.taxCategoryID, Equal<Required<PEMclTaxZone.taxCategoryID>>>>>.Select(Base, head.TaxZoneID, line.TaxCategoryID))
{
if (zone != null)
{
foreach (POTaxTran potax in PXSelect<POTaxTran,
Where<POTaxTran.orderType, Equal<Required<POTaxTran.orderType>>,
And<POTaxTran.orderNbr, Equal<Required<POTaxTran.orderNbr>>>>>.Select(Base, head.OrderType, head.OrderNbr))
{
if (potax != null)
{
potax.TaxID = zone.Taxid;
potax.TaxZoneID = zone.TaxZoneID;
Base.Taxes.Cache.Update(potax);
}
}
}
}
}
}
}
}
When I select the tax area manually, two elements are registered in the tax grid, if I do it by event it only updates the last one, I follow it by code and I see that if it updates, however, it does not reflect in the tax grid.
Here I show evidence, with images.
This step is with an event that is not working.
step 1
step 2:
step 3:
manually select the tax area, selected from the same tab.
step 1:
step 2:
That's how it should go, that's what I want the event to do.
Please tell me what I am failing in the event, I hope I have been clear, thanks.

Answer 1

The functions that grab these are the Tax Zone Extensions. You would want to override the GetDefaultTaxZone function of POOrderEntry
[PXOverride]
public virtual string GetDefaultTaxZone(POOrder row,
Func<POOrder, string> baseMethod)
{
//logic before base function
baseMethod(row);
//logic after base function
}
If you do not want any of the code to be run, feel free to copy the initial function and do not call the baseMethod delegate.