Acumatica field updated event in production order maintenance screen (AM201500) to trigger checkbox in screen based on checkbox in stock item screen

Question

I have a custom checkbox created in the "Stock Items" screen under the manufacturing screen, when this is checked I need the "Allow Preassigning Lot/Serial Numbers" to be automatically checked as well in the Production Order Maintenance screen.

My code works but when the event handler is triggered it clears out the other header fields such as the Inventory ID. How can I fix this?

Custom Checkbox in Stock Item Screen

Production Order Maintenance Screen

using PX.Objects.Common.Exceptions;
using PX.Objects.Common.Scopes;
using PX.Objects.PM;
using IQtyAllocated = PX.Objects.IN.Overrides.INDocumentRelease.IQtyAllocated;
using LocationStatus = PX.Objects.IN.Overrides.INDocumentRelease.LocationStatus;
using LotSerialStatus = PX.Objects.IN.Overrides.INDocumentRelease.LotSerialStatus;
using SiteLotSerial = PX.Objects.IN.Overrides.INDocumentRelease.SiteLotSerial;
using SiteStatus = PX.Objects.IN.Overrides.INDocumentRelease.SiteStatus;
using System;
using PX.Data;
using PX.Objects.IN;
using PX.Objects.CS;
using System.Collections;
using System.Collections.Generic;
using System.Text;
using PX.Objects.AM.GraphExtensions;
using PX.Common;
using PX.Objects.Common;
using PX.Objects.SO;
using PX.Objects.AM.Attributes;
using System.Linq;
using PX.Objects.AM.CacheExtensions;
using PX.Data.BQL.Fluent;
using PX.Data.BQL;
using PX.Objects.AR;
using PX.Objects.CR;
using PX.Objects.GL;
using PX.Objects;
using PX.Objects.AM;
using INInventoryItemExt = PX.Objects.IN.InventoryItemExt;

namespace PX.Objects.AM
{
  public class ProdMaint_Extension : PXGraphExtension<ProdMaint.ItemLineSplittingExtension,PX.Objects.AM.ProdMaint>
  {
   protected virtual void AMProdItem_InventoryID_FieldUpdated(PXCache cache, PXFieldUpdatedEventArgs e)
        {
            var row = (AMProdItem)e.Row;
            if (row?.InventoryID == null) return;

            var item = InventoryItem.PK.Find(Base, row.InventoryID);
            if (item == null) return;

            var itemExt = PXCache<InventoryItem>.GetExtension<INInventoryItemExt>(item);
            
            cache.SetValueExt<AMProdItem.preassignLotSerial>(row, itemExt.UsrAutoGenerateNumberChecker == true);
        }
      }
}

Answer 1

This implementation below worked!

 protected virtual void AMProdItem_InventoryID_FieldUpdated(PXCache cache, PXFieldUpdatedEventArgs e, PXFieldUpdated baseHandler)
        {
            baseHandler?.Invoke(cache, e);
            var row = (AMProdItem)e.Row;
            if (row?.InventoryID == null) return;

            var item = InventoryItem.PK.Find(Base, row.InventoryID);
            if (item == null) return;

           var itemExt = PXCache<InventoryItem>.GetExtension<INInventoryItemExt>(item);
            // Check if the custom checkbox (UsrAutoGenerateNumberChecker) is not ticked
            if (itemExt?.UsrAutoGenerateNumberChecker != true)
            {
        // If the checkbox is not checked, exit the method without making any changes
              return;
           }
            cache.SetValueExt<AMProdItem.preassignLotSerial>(row, true);
        }