Havin Trouble Inserting Records To A Table.. Update Works Fine

Hi..

I am getting a xml stream of data and putting it to a object and then calling a big sproc to insert or update data in many tables across my database... But there is one Table that i am having trouble inserting it.. But if i run an update it works fine... This my code for that part of the sproc..

 IF Exists(
SELECT
*
FROM
PlanEligibility
WHERE
PlanId = @PlanId
) BEGIN
UPDATE
PlanEligibility
SET
LengthOfService = Case When @PD_EmployeeContribution = 0 Then @rsLengthOfServicePS
ELSE @rsLengthOfService END,
EligibilityAge = CASE When @PD_EmployeeContribution = 0 Then @EligibilityAgePS Else @EligibilityAge End,
EntryDates = @EntryDates,
EligiDifferentRequirementsMatch = Case When @PD_EmployeeContribution = 0 Then 0
When @PD_EmployeeContribution = 1 and @PD_EmployerContribution = 0 then 0 Else 1 END, --@CompMatchM,
LengthOfServiceMatch = CASE When @MCompanyMatch = 0 Then @rsLengthOfServicePs ELSE @rsLengthOfServiceMatch END,
EligibilityAgeMatch = CASE When @MCompanyMatch = 0 Then @EligibilityAgePS ELSE @EligibilityAgeMatch END,
OtherEmployeeExclusions = @OtherEmployeeExclusions
WHERE
PlanId = @PlanId
END
ELSE BEGIN
INSERT INTO PlanEligibility
(
PlanId,
LengthOfService,
EligibilityAge,
EntryDates,
EligiDifferentRequirementsMatch,
LengthOfServiceMatch,
EligibilityAgeMatch,
OtherEmployeeExclusions
)
VALUES
(
@PlanId,
Case When @PD_EmployeeContribution = 0 Then @rsLengthOfServicePS
ELSE @rsLengthOfService END,--@rsLengthOfService,
CASE When @PD_EmployeeContribution = 0 Then @EligibilityAgePS Else @EligibilityAge End, --@EligibilityAge,
@EntryDates,
Case When @PD_EmployeeContribution = 0 Then 0
When @PD_EmployeeContribution = 1 and @PD_EmployerContribution = 0 then 0 Else 1 END, --having trouble here
CASE When @MCompanyMatch = 0 Then @rsLengthOfServicePs ELSE @rsLengthOfServiceMatch END,
CASE When @MCompanyMatch = 0 Then @EligibilityAgePS ELSE @EligibilityAgeMatch END, --EligibilityAgeMatch,@EligibilityAgeMatch,
@OtherEmployeeExclusions
)
END

 Any help will be appreciated..

Regards,

Karen