PFI (ABAP) - Not Enough Dialog Resources (PFI aspfi05_PFI_00 (ABAP_SRV))
Root cause: 
The ABAP instance had limited or no resources left for dialog processing, resulting in a 'Not Enough Dialog Resources' alert. This was indicated by 17 long-running dialog work processes with a minimum runtime of 1200 seconds.  
 
Resolution steps: 
All the WP are free in the system.