Autocreate and/or update ASLs and Sourcing Rules

Hello,

Following some notes, I'm trying to autocreate and/or update ASLs and Sourcing Rules:

1.    Set up: Profile Option PO: Allow Auto-generate Sourcing Rules.

2.    Go to the Blanket, Click: APPROVE, tab: Additional Options. I’m not able to modify any value. It’s suppose to be mandatory update the “release generation method”, or check “Enable Automatic Sourcing”, or check “update existing sourcing rule and assignment”, but it’s not available.

What am I missing?

Thank you,