Concurrent getting to conflict mode

 Hi

Found one of the concurrent "A" is not processed by conflict resolution manager and has below error

As per the concurrent request diagnostics it shows as below:
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This request is waiting to be processed by the Conflict Resolution Manager.

This request cannot yet begin execution because other requests may conflict with it. The Conflict Resolution Manager will determine when this request may begin execution. 
User SYSADMIN submitted this request on ..............

No action required. This is a normal condition.

This request may have to wait on one or more of the following requests 

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Found that this concurrent is set incompatible to one more concurrent "B"