How can I override the LotSerialStatusByCostCenter accumulator attribute?

Question

public override void Initialize() { base.Initialize(); PXCache cacheBase = Base.Caches[typeof(INLotSerialStatusByCostCenter)]; cacheBase.Interceptor = new BZAccumulatorAttribute(); }public class BZAccumulatorAttribute : PX.Objects.IN.InventoryRelease.Accumulators.QtyAllocated.LotSerialStatusByCostCenter.AccumulatorAttribute{ public BZAccumulatorAttribute() : base() { _SingleRecord = true; } protected override bool PrepareInsert(PXCache cache, object row, PXAccumulatorCollection columns) { bool ret = base.PrepareInsert(cache, row, columns); SiteStatusByCostCenter siteStatusByCostCenter = (SiteStatusByCostCenter)row; InventoryItem item = InventoryItem.PK.Find(cache.Graph, siteStatusByCostCenter.InventoryID); if (item != null) { BZInventoryItemExt itemExt = item.GetExtension(); if (siteStatusByCostCenter.SkipQtyValidation != true && siteStatusByCostCenter.ValidateHardAvailQtyForAdjustments == true && siteStatusByCostCenter.QtyHardAvail < itemExt.UsrBZThresholdQty) { columns.AppendException(string.Empty, new PXAccumulatorRestriction(PXComp.GE, itemExt.UsrBZThresholdQty)); ret = false; } } return ret; }}In LotSerialStatusByCostCenter Accumulator Attribute PrepareInsert method, there is code like if (diff.QtyOnHand < 0m) columns.Restrict(PXComp.GE, -diff.QtyOnHand);. I want to override it and add a check (for example, if qty < 10, throw an error). How does it throw an error when qty < 0 if ‘Allow Negative’ is not enabled? I want to do this on the Invoice screen. How can I do this?

kbibelhausen · Answer

You can override the LotSerialStatusByCostCenter accumulator attribute using a cache interceptor in a graph extension. Here's the approach:

## Create a Custom Accumulator Attribute

First, create your custom accumulator attribute that inherits from the original or PXAccumulatorAttribute:

```csharp

public class CustomLotSerialStatusByCostCenterAccumulator : PXAccumulatorAttribute

{

public CustomLotSerialStatusByCostCenterAccumulator(params Type[] fields)

: base(fields)

{

// Your custom logic here

}

// Override methods as needed

public override List UpdateParameters(PXCache sender, object row, PXDataFieldParam[] pars, PXDataFieldParam[] keys, UpdateMode mode)

{

// Custom update logic

return base.UpdateParameters(sender, row, pars, keys, mode);

}

```

## Apply the Override Using Cache Interceptor

In your graph extension's Initialize method, replace the accumulator attribute:

```csharp

public class YourGraphExtension : PXGraphExtension

{

public override void Initialize()

{

base.Initialize();

PXCache cache = Base.Caches[typeof(LotSerialStatusByCostCenter)];

cache.Interceptor = new CustomLotSerialStatusByCostCenterAccumulator(

// Specify the fields that should be accumulated

typeof(LotSerialStatusByCostCenter.qtyOnHand),

typeof(LotSerialStatusByCostCenter.qtyAvail)

// Add other relevant fields

);

}

```

## Key Points

- The cache interceptor approach replaces the existing accumulator attribute entirely

- You'll need to identify which fields are being accumulated in the original attribute

- Make sure to call `base.Initialize()` before setting the interceptor

- Test thoroughly as accumulator attributes affect data consistency and concurrency handling

This pattern follows the same approach shown in the knowledge base for customizing other accumulator attributes like AverageCostStatus.

---

Drafted by AcuDev (AI) · Reviewed by Kevin Bibelhausen, Studio B

AcuOps — AI-powered environment management for Acumatica · b.studio

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