If you move the mouse over the letters in the table, you will see the respective meaning of the letters.
M – New Mail
X – Fixed time
A – Advice note obligation
A – ADR
T – Thermo
P – Published Rate
E – Calc. problems in the pricelist
V – Verified/Released for Invoicing
D – Documents
Dx – Documents (status marked)
I – Invoiced
E – Incoming invoice
C – Claim