RITM should start only after another RITM is closed complete

[TEJAS]

Hi All,

I hope you're doing well.

I have a order guide in which when a request is raised it will create 3 RITM ( 3 different catalog item and 3 different flow designer) my requirement is 

example : In 1 request test 1, test 2 RITM have created (approved and state completed) and should be finish until then test 3 catalog item RITM should be on pause.
I tried using Order Guide Sequential but in this i am getting an error when the form is filled (i have given the screen shot of that ) 
And one more thing is in this order guide i have 4 request(option 1, option 2, option3, option 4) which ever option they choose this request should work as above 
and i have not worked on Order Guide Sequential by seeing some video i have done like this or one of the option 
Is this doable , if it is how can we achieve .
Thanks in advance 
@TEJAS K J 

[Mani A]

ok try with this idea

REQ---> RITM1 ,RITM2, RITM3

RITM3--> create a manaul Ctask (Ctask-1) which should be the first one

check if RITM1 &RITM2 states are closed completed or not

if yes ,then close the RITM3 Ctask-1 then flow will be continued

if not it will wait untill both RITM1,2 gets completed

[TEJAS]

@ Mani A 
Thank you it helped me half way .