Hey 

i'm trying to delete records WSHUOMStructure table based on condition, it gives me an error 

Cannot delete a record in Unit Structure (WHSUOMStructure). An update conflict occurred due to another user process deleting the record or changing one or more fields in the record

i tried many things like i used delete_from inside ttsbegin ttscomitt , 
i tried while select for update then tablebuffer.delete inside ttsbegin ttscomitt

i tried i tried while select for update then tablebuffer.reread() then tablebuffer.delete() inside ttsbegin ttscomitt

i tried while select pessimisticLock 

but nothing works

also OCC enable property on the table is set to YES and i can't change it throw table extension 

any help please ?