Error "RefNbr cannot be found" when using CopyChildLink with a complex PXSelector in CacheAttached

I'm facing a validation issue when trying to use the CopyChildLink attribute on a field that has its selector overridden in CacheAttached.
 

        [PXRemoveBaseAttribute(typeof(ARInvoiceType.AdjListAttribute))]
        [ARInvoiceTypeExt.AdjList]
        protected virtual void _(Events.CacheAttached<ARPaymentTotals.adjdDocType> e)
        {
        }

        [PXRemoveBaseAttribute(typeof(ARInvoiceType.AdjdListAttribute))]
        [ARInvoiceTypeExt.AdjdList]
        protected virtual void _(Events.CacheAttached<ARAdjust.adjdDocType> e)
        {
        }

        [PXMergeAttributes(Method = MergeMethod.Replace)]
        [PXDBString(15, IsKey = true, IsUnicode = true, InputMask = ">CCCCCCCCCCCCCCC")]
        [PXDefault]
        [PXUIField(DisplayName = "Reference Nbr.", Visibility = PXUIVisibility.Visible)]
        [ARInvoiceType.AdjdRefNbr(typeof(Search2<ARInvoice.refNbr,
            LeftJoin<ARAdjust, On<ARAdjust.adjdDocType, Equal<ARInvoice.docType>,
                And<ARAdjust.adjdRefNbr, Equal<ARInvoice.refNbr>,
                And<ARAdjust.released, NotEqual<True>,
                And<ARAdjust.voided, NotEqual<True>,
                And<Where<ARAdjust.adjgDocType, NotEqual<Current<ARRegister.docType>>,
                    Or<ARAdjust.adjgRefNbr, NotEqual<Current<ARRegister.refNbr>>>>>>>>>,
            LeftJoin<ARAdjust2, On<ARAdjust2.adjgDocType, Equal<ARInvoice.docType>,
                And<ARAdjust2.adjgRefNbr, Equal<ARInvoice.refNbr>,
                And<ARAdjust2.released, NotEqual<True>,
                And<ARAdjust2.voided, NotEqual<True>>>>>,
            LeftJoin<Customer, On<ARInvoice.customerID, Equal<Customer.bAccountID>>,
            LeftJoin<SOInvoice, On<ARInvoice.docType, Equal<SOInvoice.docType>, And<ARInvoice.refNbr, Equal<SOInvoice.refNbr>>>>>>>,
            Where<ARInvoice.docType, Equal<Optional<ARAdjust.adjdDocType>>,
                And2<Where<ARInvoice.released, Equal<True>,
                    Or<ARInvoice.origModule, Equal<BatchModule.moduleSO>,
                    And<ARInvoice.docType, NotEqual<ARDocType.creditMemo>>>>,
                And<ARInvoice.openDoc, Equal<True>,
                And<ARInvoice.hold, Equal<False>,
                And<ARAdjust.adjgRefNbr, IsNull,
                And2<Where<ARAdjust2.adjdRefNbr, IsNull, Or<ARInvoice.docType, Equal<ARDocType.prepaymentInvoice>>>,
                And2<Where<ARInvoice.docType, NotEqual<ARDocType.prepaymentInvoice>, Or<ARInvoice.pendingPayment, Equal<True>>>,
                And<ARInvoice.customerID, In2<Search<PX.Objects.AR.Override.BAccount.bAccountID,
                    Where<PX.Objects.AR.Override.BAccount.bAccountID, Equal<Optional<ARRegister.customerID>>,
                        Or<PX.Objects.AR.Override.BAccount.consolidatingBAccountID, Equal<Optional<ARRegister.customerID>>>>>>,
                And2<Where<ARInvoice.pendingPPD, NotEqual<True>,
                    Or<Current<ARRegister.pendingPPD>, Equal<True>>>,
                And<Where<
                    Current<ARSetup.migrationMode>, NotEqual<True>,
                    Or<ARInvoice.isMigratedRecord, Equal<Current<ARRegister.isMigratedRecord>>>>>>>>>>>>>>>), Filterable = true)]
        [CopyChildLink(typeof(ARPaymentTotals.invoiceCntr), typeof(ARAdjust.curyAdjdAmt),
            new Type[] { typeof(ARAdjust.adjdDocType), typeof(ARAdjust.adjdRefNbr) },
            new Type[] { typeof(ARPaymentTotals.adjdDocType), typeof(ARPaymentTotals.adjdRefNbr) })]
        protected virtual void _(Events.CacheAttached<ARAdjust.adjdRefNbr> e)
        {
        }

The Problem: When the CopyChildLink attribute is present, I get the following error: Error: [AdjdRefNbr] 'XXXXXXX' cannot be found in the system.

If I comment out the [CopyChildLink] attribute, the error disappears and the selector works perfectly, allowing me to select the document. It seems like CopyChildLink triggers a validation that fails because the document doesn't match the selector's strict Where criteria at the moment of linking, or it interferes with how the cache handles the record.