German to English Bus/Financial Finance (general)

Headings in a table, with lots of abbreviations, about investment management statistics. This "Dev." keeps coming up, here are a few examples:
- Einst.Dev.
- Akt. Dev.
(Einst. probably stands for Einstand, as in Einstandskurs)
Then again
- GuV (abs.)
- GuV Dev (abs.)
where GuV is clear (P&L)
and
- Summe Kurs-GuV
- Summe Dev.-GuV

Could it be 'Devisen'? (Unfortunately, the table itself is not available, only the designations were provided) and I am not sure how to understand Dev.-GuV (minus?)
TIA