c# - sql update statement conflict with foreign key -

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i trying update sql table stored procedure:

set ansi_nulls on go set quoted_identifier off go  create procedure [dbo].[updatepostingstatusangel]      @postingstatusid tinyint,      @postingid int update dbo.posting set     postingstatusid = @postingstatusid postingid = @postingid

when executing query getting error: the update statement conflicted foreign key constraint "fk_posting_paymentstatus". conflict occurred in database "jobsdb2008", table "dbo.paymentstatus", column 'paymentstatusid'.

this weird because not updating 'paymentstatusid' column don't know why gives me conflict on column. column set null , has value already. trying update postingstatusid field. idea can reason? in advance, laziale

the value stored in paymentstatusid column must not exist in paymentstatus table.

ensure postingstatusid, paymentstatusid valid id's , exist in appropriate tables.

select paymentstatusid, postingstatusid  posting postingid = @postingid

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