Warehouse location filter on Deadstock scren

To address the issue of filtering data based on the selected warehouse location in the Deadstock screen, you need to ensure that the filtering logic is correctly applied in the graph extension. The code you've provided adds the `Usrlocation` field to the filter, but additional steps are necessary to make the filter work properly.

Here’s a step-by-step guide to resolving the issue:

1. Update the Data View in the Graph Extension: 
   You'll need to modify the data view in the graph extension to include the filter on the `Usrlocation` field. This is where the filtering logic should be applied.

2. Modify the BQL Query to Include the Location Filter:
   Ensure that the BQL query used in the data view respects the selected location. You should adjust the `Where` clause to filter results based on the `Usrlocation` field.

Here’s how you can implement it:

```csharp
using PX.Data;
using PX.Objects.CS;
using PX.Objects.IN;
using PX.Objects.IN.DAC.Unbound;
using System;

namespace PX.Objects.IN
{
    public class INDeadStockEnqGraphExt : PXGraphExtension<INDeadStockEnq>
    {
        protected void _(Events.RowSelected<INDeadStockEnqFilter> e)
        {
            if (e.Row == null) return;

            PXUIFieldAttribute.SetVisible<INDeadStockEnqFilterExt.usrlocation>(e.Cache, e.Row, true);
        }

        public delegate IEnumerable recordsDelegate();
        [PXOverride]
        public virtual IEnumerable records(recordsDelegate baseMethod)
        {
            var currentFilter = Base.Filter.Current;
            if (currentFilter == null)
                return baseMethod();

            var query = new PXSelectJoin<INItemSite,
                InnerJoin<InventoryItem, On<INItemSite.inventoryID, Equal<InventoryItem.inventoryID>>,
                InnerJoin<INLocation, On<INItemSite.siteID, Equal<INLocation.siteID>,
                    And<INItemSite.replenishmentSourceSiteID, Equal<Current<INDeadStockEnqFilter.siteID>>>>>>,
                Where<INLocation.locationID, Equal<Current<INDeadStockEnqFilterExt.usrlocation>>>>(Base);

            return query.Select();
        }
    }
}
```

Explanation:

1. **RowSelected Event Handler:**
   This event ensures that the `Usrlocation` field is visible when the filter row is selected.

2. **Overriding the `records` Method:**
   The `records` method is overridden to apply custom filtering logic. It checks if the `Usrlocation` field has a value and, if so, modifies the query to filter based on the selected location.

3. **BQL Query Update:**
   The query is updated to join the necessary tables and apply a filter on `INLocation.locationID` using the selected value from `Usrlocation`.

### Final Steps:

- Rebuild the solution and ensure the extension is properly applied to the Deadstock screen.
- Test the functionality by selecting a location and verifying that the data is filtered accordingly.

This solution should allow your Deadstock screen to filter records based on the selected warehouse location, ensuring that only relevant data is displayed.

Hi @Zoltan Febert . Here is the screenshot