GP Batch Posting Error

Error Message:
Subquery returned more than 1 value. This is not permitted when the subquery follows =, !=, <, <= , >, >= or when the subquery is used as an expression


We have just started receiving this error in Great Plains 10 when a user attempts to Post a Sales Batch at the end of the day. The Post seems to still occur, but not before providing this error in a message box 4 or 5 times first. No change has been made to the query or process that posts here.
ryanwhAsked:
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jogosConnect With a Mentor Commented:
To complete, you mentioned the query was not changed. Exactly, it's the table content that triggers the error and only when multiple rows are found.  So in the above example it could be running for months without a problem and the moment the second Jones is hired the problem begins.
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jogosCommented:
That's mostly something like

select street from adres
where employeeid = (select employeeid from employees where name = 'Jones')

and this runs fine when there is only 1 employee called Jones. The '=' expects only 1 value to be returned but with duplicates occur  

solutions
a) where employeeid IN (.....)
-> you get all the adresses from employees with the name Jones

b) = (select top 1 employeeid from employees ....)
selects only the first, in this case most likely 'forgetting' other employees

c) = (select employeeid from employees where name = 'jones' and firstname = 'Peter')
-> more specific so LESS likely there are duplicates  
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