Transport Tracks in CHARM

Hi experts,

Can below transport tracks works successfully in charm ??

DV1 -> QA1-> PP1-> PRD->DV2 - Maintenance Landscape

DV2->QA2->DV1->QA1->PP1->PRD - Project Landscape

I have two queries

1) In Maintenance Landscape, how we can carry on transports from PRD to DV2 ? if DV1 and DV2 are retrofitted already then how CHARM behaves ? any other implications ?

2) In Project Landscape, how system will behave or implications once transport reach DV1 from DV2 ??

Thanks

Sateesh