I have added a bounty to this as I have, as yet been able to figure this out and time is out.
The below stored procedure will not allow me to add it to Modify it. When attempting to modify it I get the following error -->
Msg 213, Level 16, State 1, Procedure spPersonRelationshipAddOpposing, Line 51
Insert Error: Column name or number of supplied values does not match table definition. 
Also, Since the DB was set up for Merge Rep (a rowguid column has been added) this stored procedure now no longer works properly.
Do I need to chang the way the columns are listed? One of the warnings when setting up Merge Rep was this -->
Adding Guid Column MAY Cause INSERT Statements without column lists to Fail
What does that mean? Ideas on how I fix this?
USE [Connect]
GO
/****** Object:  StoredProcedure [dbo].[spPersonRelationshipAddOpposing]    Script Date: 07/15/2009 08:14:35 ******/
SET ANSI_NULLS ON
GO
SET QUOTED_IDENTIFIER ON
GO
ALTER PROCEDURE [dbo].[spPersonRelationshipAddOpposing]
@ExistingRelationshipID INT 
AS
BEGIN
--Declare local variables
DECLARE @PersonID INT  --PersonID of established relarionship
DECLARE @RelatedID INT  --RelatedID of established relarionship
DECLARE @Relationship VARCHAR(4)  --Established relarionship
DECLARE @RelatedSex as VARCHAR(1)  
DECLARE @OpposingRelationship VARCHAR(4)
DECLARE @OpposingRelationshipID INT
--Fill variables from existing relationship
SELECT @PersonID = PersonID, @RelatedID = RelatedID, @Relationship=PersonRelationshipTypeID
FROM tblPersonRelationship where PersonRelationshipID = @ExistingRelationshipID
--Get gender of relative for finding opposing relationship type
SELECT @RelatedSex = (SELECT Gender FROM tblPerson WHERE PersonID = @PersonID)
--get opposing relationship types
IF (@RelatedSex='M')
    BEGIN
    SELECT @OpposingRelationship = (SELECT OpposingMaleRelationship 
                                    From tblAdminPersonRelationshipType 
                                    WHERE PersonRelationshipTypeID = @Relationship)
    END
ELSE IF (@RelatedSex='F')
    BEGIN
    SELECT @OpposingRelationship = (SELECT OpposingFemaleRelationship 
                                    From tblAdminPersonRelationshipType 
                                    WHERE PersonRelationshipTypeID = @Relationship)
    END
--check for existing opposing relationship
SELECT @OpposingRelationshipID = (SELECT MAX(PersonRelationshipID) FROM tblPersonRelationship WHERE PersonID = @RelatedID AND RelatedID = @PersonID)
--if an opposing relationship was found
IF (@OpposingRelationship IS NOT NULL)
    BEGIN
--if there is a relationship, update it
    IF ISNUMERIC(@OpposingRelationshipID)=1 
        BEGIN
            UPDATE tblPersonRelationship
            SET PersonRelationshipTypeID = @OpposingRelationship,
                MarriageDate = (SELECT MarriageDate FROM tblPersonRelationship WHERE PersonRelationshipID = @ExistingRelationshipID),
                ResidesWithPersonFlag = (SELECT ResidesWithPersonFlag FROM tblPersonRelationship WHERE PersonRelationshipID = @ExistingRelationshipID),
                UpdateDateTime = (SELECT UpdateDateTime FROM tblPersonRelationship WHERE PersonRelationshipID = @ExistingRelationshipID),
                UpdateProgram = (SELECT UpdateProgram FROM tblPersonRelationship WHERE PersonRelationshipID = @ExistingRelationshipID),
                UpdateUserID = (SELECT UpdateUserID FROM tblPersonRelationship WHERE PersonRelationshipID = @ExistingRelationshipID) 
            WHERE PersonRelationshipID = @OpposingRelationshipID
        END
--otherwise add record
    ELSE IF (@OpposingRelationship IS NOT NULL)
        BEGIN
            INSERT INTO tblPersonRelationship 
                SELECT @RelatedID, @OpposingRelationship, @PersonID,
                       MarriageDate, NULL, NULL, 
                       ResidesWithPersonFlag, NULL, UpdateDateTime, UpdateProgram,
                       UpdateUserID, UpdateDateTime, UpdateProgram, 
                       UpdateUserID, NULL FROM tblPersonRelationship WHERE PersonRelationshipID = @ExistingRelationshipID
        END
    END
END