i tried to change invoice sequence from automatic to manual sequence

i tried to change invoice sequence from automatic to manual sequence 

i end the sequence which assigned to the invoice source

i create new sequence with manual sequence and assigned it to the invoice source

when i tried to run auto invoice master program and try to select invoice source i did,t find this source

and note that before changing the sequent the invoice source was appeared

please need to solve this problem because the auto invoice is stopped

thanks