Allow transition to only previous status

Viktor23

I have a status Blocked, to which there are 4 transitions from 4 different statuses. It is required to allow to transition from Blocked status to only status, which was before the Blocked one.

 

How can I achieve that except to create for new Blocked statuses?

Sten Sundelin

We use a SIL script as a Condition on each transition "going back", something like this:

//Check if the previous step was Open Architecture

number STATUS_OPEN_ARCH = 10018;
string[] status_history = fieldHistory(key, "status");

if (arrayGetElement(status_history,arraySize(status_history)-3) == STATUS_OPEN_ARCH){

return true;
} else {
return false;
}