leak91

APU bleed valve PMDG738

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So I'm reading the 738 FCOM v1 and I see that in the limitations section it says:

"APU bleed valve must be closed when: 
• ground air connected and isolation valve open
• engine no. 1 bleed valve open
• isolation and engine no. 2 bleed valves open."

At the same time, in the Normal Procedures section when you read the preflight checklist, it says that you should have both the Engine bleed valves open and the APU bleed valve, and that you should confirm that the "dual bleed" light is iluminated. This seems pretty weird to me since a) this contradicts the limitations chapter b) the dual bleed light is an orange light, which usually to my understanding indicates a warning (hence something that should not be happening)? 

I'm sure there is a logical explanation, I just don't seem to figure it out...

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