CRQuote PXDBScalar Always Null - No Subquery

I am struggling to add a PXDBScalar field to a CRQuote extension. In my customization, I have added a NonPersistedField to CR.CRQuote:

[PXDecimal]
[PXUIField(DisplayName="Lead Days (Rev)")]
[PXDBScalar(typeof(Search<
PBSA.UsrQTRevision.leadDays, Where<
 PBSA.UsrQTRevision.opportunityID, Equal<CRQuote.opportunityID>, And<
  PBSA.UsrQTRevision.quoteNbr, Equal<CRQuote.quoteNbr>, And<
   PBSA.UsrQTRevision.revNbr, Equal<CRQuoteExt.usrRevNbr>
   >
  >
 >
>))]

PBSA.UsrQTRevision is a custom table and DAC. I have another table and DAC like it for Sales Orders called UsrSORevision. For troubleshooting purposes I have added a similar PXDBScalar field to a SOOrder DAC extension:

[PXDecimal]
[PXUIField(DisplayName="Lead Days (Rev)")]
[PXDBScalar(typeof(Search<
PBSA.UsrSORevision.leadDays, Where<
 PBSA.UsrSORevision.orderType, Equal<SOOrder.orderType>, And<
  PBSA.UsrSORevision.orderNbr, Equal<SOOrder.orderNbr>, And<
   PBSA.UsrSORevision.revNbr, Equal<SOOrderExt.usrRevNbr>
   >
  >
 >
>))]

The SOOrder one works. The CRQuote one always gives me a null value in the DAC Browser Source Data preview, and when i examine the query in the trace, CRQuote is not trying to fetch the value:

SELECT
  TOP (23) [CRQuote_CRQuote].[QuoteID] AS [CRQuote_QuoteID],
  [CRQuote_CROpportunityRevision].[OpportunityID] AS [CRQuote_OpportunityID],
  [CRQuote_CRQuote].[QuoteNbr] AS [CRQuote_QuoteNbr],
  ...
  NULL AS [CRQuote_UsrLeadDaysRev]
FROM
  (
    [CRQuote] [CRQuote_CRQuote]
    INNER JOIN [CROpportunityRevision] [CRQuote_CROpportunityRevision] ON ([CRQuote_CROpportunityRevision].[CompanyID] = 2)
    AND (
      [CRQuote_CROpportunityRevision].[BranchID] IS NULL
      OR (
        [CRQuote_CROpportunityRevision].[BranchID] IN (24, 25, 26)
      )
    )
    AND [CRQuote_CROpportunityRevision].[NoteID] = [CRQuote_CRQuote].[QuoteID]
    LEFT JOIN [CROpportunity] [CRQuote_CROpportunity] ON ([CRQuote_CROpportunity].[CompanyID] = 2)
    AND [CRQuote_CROpportunity].[OpportunityID] = [CRQuote_CROpportunityRevision].[OpportunityID]
  )
WHERE
  ([CRQuote_CRQuote].[CompanyID] = 2)
ORDER BY
  [CRQuote_CROpportunityRevision].[OpportunityID],
  [CRQuote_CRQuote].[QuoteNbr] OPTION (OPTIMIZE FOR UNKNOWN)

While the SOOrder in the same preview is creating a subquery for the field:

SELECT
  TOP (22) [SOOrder].[BranchID] AS [SOOrder_BranchID],
  [SOOrder].[RiskLineCntr] AS [SOOrder_RiskLineCntr],
  [SOOrder].[OrderType] AS [SOOrder_OrderType],
  [SOOrder].[Behavior] AS [SOOrder_Behavior],
  [SOOrder].[OrderNbr] AS [SOOrder_OrderNbr],
  ...
  (
    SELECT
      TOP (1) [UsrSORevision].[LeadDays]
    FROM
      [UsrSORevision] [UsrSORevision]
    WHERE
      ([UsrSORevision].[CompanyID] = 2)
      AND (
        [UsrSORevision].[OrderType] = [SOOrder].[OrderType]
        AND [UsrSORevision].[OrderNbr] = [SOOrder].[OrderNbr]
        AND [UsrSORevision].[RevNbr] = [SOOrder].[UsrRevNbr]
      )
    ORDER BY
      [UsrSORevision].[LeadDays]
  ) AS [SOOrder_UsrLeadDaysRev],
  ...
FROM
  [SOOrder] [SOOrder]
WHERE
  ([SOOrder].[CompanyID] = 2)
  AND ([SOOrder].[DatabaseRecordStatus] = 0)
  AND (
    [SOOrder].[BranchID] IS NULL
    OR ([SOOrder].[BranchID] IN (24, 25, 26))
  )
ORDER BY
  [SOOrder].[OrderType],
  [SOOrder].[OrderNbr] OPTION (OPTIMIZE FOR UNKNOWN)

I suspect there is something different about CRQuote because it is a projection, but this post suggests it is possible to use PXDBScalar in projections. 

If I sort or filter on the CRQuote scalar column, a subquery is created:

SELECT
  TOP (23) [CRQuote_CRQuote].[QuoteID] AS [CRQuote_QuoteID],
  [CRQuote_CROpportunityRevision].[OpportunityID] AS [CRQuote_OpportunityID],
  [CRQuote_CRQuote].[QuoteNbr] AS [CRQuote_QuoteNbr],
  ...
  NULL AS [CRQuote_UsrLeadDaysRev]
FROM
  (
    [CRQuote] [CRQuote_CRQuote]
    INNER JOIN [CROpportunityRevision] [CRQuote_CROpportunityRevision] ON ([CRQuote_CROpportunityRevision].[CompanyID] = 2)
    AND (
      [CRQuote_CROpportunityRevision].[BranchID] IS NULL
      OR (
        [CRQuote_CROpportunityRevision].[BranchID] IN (24, 25, 26)
      )
    )
    AND [CRQuote_CROpportunityRevision].[NoteID] = [CRQuote_CRQuote].[QuoteID]
    LEFT JOIN [CROpportunity] [CRQuote_CROpportunity] ON ([CRQuote_CROpportunity].[CompanyID] = 2)
    AND [CRQuote_CROpportunity].[OpportunityID] = [CRQuote_CROpportunityRevision].[OpportunityID]
  )
WHERE
  (
    (
      SELECT
        TOP (1) [UsrQTRevision].[LeadDays]
      FROM
        [UsrQTRevision] [UsrQTRevision]
      WHERE
        ([UsrQTRevision].[CompanyID] = 2)
        AND (
          [UsrQTRevision].[OpportunityID] = [CRQuote_CROpportunityRevision].[OpportunityID]
          AND [UsrQTRevision].[QuoteNbr] = [CRQuote_CRQuote].[QuoteNbr]
          AND [UsrQTRevision].[RevNbr] = [CRQuote_CRQuote].[UsrRevNbr]
        )
      ORDER BY
        [UsrQTRevision].[LeadDays]
    ) >.0
  )
  AND ([CRQuote_CRQuote].[CompanyID] = 2)
ORDER BY
  [CRQuote_CROpportunityRevision].[OpportunityID],
  [CRQuote_CRQuote].[QuoteNbr] OPTION (OPTIMIZE FOR UNKNOWN)

But the field select still doesn’t get the subquery. If I take the query into SSMS, it does find data:

What am I doing wrong? Is this not possible on CRQuote? Do I need to do something extra with the Standalone?

Thank you for reading.