'BPM-0672: Un-matched Split-Join Pair found' when validating a process

Document ID : KB000055043
Last Modified Date : 14/02/2018
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Description:  
I get a 'BPM-0672: Un-matched Split-Join Pair found' when validating a process.  What causes this message?  

Solution:  
An incorrect Pre-Condition join type is being matched with a Post-Condition Split Join Type.

Use the following pre-condition join types with the post-condition split join type.

Serial Split - does not need a join
Parallel Split (AND) - Requires a Rendezvous Join
Decision Point (XOR) - Requires a Merge Join
Multiple Choice (OR) - Requires a 'First in Line', 'Wait and Merge' or a 'Multi-thread' Join.