[Use of Option Access syntax in formulas] - SubPageLink with Provider does not allow it

[Duizy1971]

In AL 10.0 the use of option access syntax in formulas was introduced. It does not work in all cases yet, not even in 10.1.
We have a feature on for instance a sales order page extension that shows in two factboxes either the sales header or the line comments for a particular page.
The AL compiler recognizes the translation of 42 to Page::"Sales Order" on the SubPageLink of the HeaderCommentLines but fails on the same property on the LineCommentLines. Probably has something to do with the use of the Provider property.

    addafter(Control1900316107)
    {
        part(HeaderCommentLinesA105; "A105 Sales Doc. Comment Factb")
        {
            ApplicationArea = Basic, Suite;
            Caption = 'Header Comment Lines';
            ShowFilter = false;
            SubPageLink = "Document Type" = field("Document Type"),
                          "No." = field("No."),
                          "Document Line No." = const(0),
                          "Line No." = const(Page::"Sales Order");
        }
    }
    addafter(Control1907234507)
    {
        part(LineCommentLinesA105; "A105 Sales Doc. Comment Factb")
        {
            ApplicationArea = Basic, Suite;
            Caption = 'Line Comment Lines';
            Provider = SalesLines;
            ShowFilter = false;
            SubPageLink = "Document Type" = field("Document Type"),
                          "No." = field("Document No."),
                          "Document Line No." = field("Line No."),
                          "Line No." = const(42);
            SubPageView = where("Document Line No." = filter(<> 0));
        }
    }

[Duizy1971]

Moved to AL