MSMP Stage Execution Sequence Number

Dear Experts,

when browsing through the MSMP related tables, I stumbled upon the field

STAGE_EXEC_SEQNR: Stage Execution Sequence Number

(e.g. in the tables GRFNMWRTINSTWI and GRFNMWRTSTAPPR)

What is the use of this field and what information does it contain?
I'd really appreciate your help or even reference some useful resource.

Thank you!