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In the pneumatic system on On the A320 in the limitations chapter it's said, why is it not recommended to avoid usinguse the HP ground unit when the APU Bleed is in useon?

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In the pneumatic system on the A320 in the limitations chapter it's said to avoid using the HP ground unit when APU Bleed is in use?

Can someone explain what the HP ground unit is used for? And what damage happens to the bleed system if it is used?