Unable to Maintain Variable Value Between Modules

[Ark68]

I am trying to open a userform in one workbook from an event in my main code holding workbook.

From a click of an object in workbook1

Private Sub lb_cntmissp_Click()
    If lb_cntmissp.Caption = "0" Then Exit Sub
    With wb_rd
        Application.Run wb_rd.Name & "!macro_01"
    End With
End Sub

!macro_01 is accessed in workbook2 (wb_rd).

Public mri As Boolean
Sub macro_01()
    mri = True
    MsgBox "MRI: " & mri
    declarations_1
    'group_1.Show
End Sub

Declarations is a module (in workbook2) where all my worksheets for workbook2 are defined publically, and quite a bit in the application of userform 'group_1'.
MRI is a value used to flag a certain procedure in the initialization of the userform 'group_1'

Public mbevents As Boolean
Public ws_rd As Worksheet
Public ws_rm As Worksheet
Public ws_amm As Worksheet
Public ws_lists As Worksheet
Public ws_Cust As Worksheet
Public ws_group As Worksheet
Public ws_vh As Worksheet
Public pn As Long
Public CH, df1 As Integer
'Public mri As Boolean

Sub declarations_1()
    Set wb_rd = Workbooks("Rental_Detail.xlsm")
    Set ws_rd = wb_rd.Worksheets("Rental_Data")
    Set ws_rm = wb_rd.Worksheets("Rental_Main")
    Set ws_amm = wb_rd.Worksheets("Ammendments")
    Set ws_lists = wb_rd.Worksheets("LISTS")
    Set ws_Cust = wb_rd.Worksheets("Customer_Default")
    Set ws_group = wb_rd.Worksheets("Group_Defaults")
    Set ws_vh = wb_rd.Worksheets("VAR_HOLD")
    
    group_1.Show
End Sub

The problem I am having, is I'm unable to maintain the value of MRI. In macro_01 it is set to true, but when it reaches the Declarations module, it's false.

What can I do to maintain this variable's value? I though defining it as public would do it. Maybe I'm not declaring it in the right place?

 

[Ark68]

I switched from using mri as a boolean to mri as long and I seem to have gotten some progress.