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I'm having few problems using multiline headers in pro edition. This method had changed in this edition? How can use?

The multiline headers work exactly the same in both pro and standard edtions ( basically the both editions has the same codebase, so code which works in standard will work in pro version as well )
The syntax of command also the same in both editions.
If problem still occurs for you - please provide any kind of sample where it can be reconstructed.