Getting a Heloc and a mortgage at the same time

[Nat Tata]

I am trying to buy a property and get a mortgage on it and at the same time I want to take out a HELOC on my other property. These two will be at different banks, but my concern is that the banks might not approve either one of them if I do it at the same time. Should I try to get a morgage first and then go for a HELOC? Banks tell you not to open any lines of credit while the mortgage is being processed because they might not approve it. Please help; thank you.