A1       The Interconnect Mailbag Acknowledgment Count is Not Equal to the Actual 
         Interconnect Mailbag Acknowledgment Count
B1       The Interconnect Mailbag Interchange Count is Not Equal to the Actual 
         Interconnect Mailbag Interchange Count
C1       The IH and IT Mailbag Header and Trailer Control Numbers Are Not Identical
D1       Invalid Interconnect Mailbag Version Number
E1       Invalid Interconnect Mailbag Logon ID
F1       Invalid Interconnect Mailbag Password
G1       Invalid Interconnect Mailbag ID Qualifier Code
H1       Invalid Interconnect Mailbag Sender ID
I1       Invalid Interconnect Mailbag Receiver ID
J1       Invalid Interconnect Mailbag Date
K1       Invalid Interconnect Mailbag Time
L1       Invalid Interconnect Mailbag Time Code
M1       Invalid Interconnect Mailbag Test Indicator
N1       Invalid Interconnect Mailbag Action Code
O1       Invalid Interconnect Mailbag Error Code
P1       Invalid Interconnect Mailbag Control Number
Q1       Invalid Interconnect Mailbag Acknowledgment Count
R1       Invalid Interconnect Mailbag Interchange Count
S1       Invalid Interconnect Mailbag Data Element Separator
T1       Invalid Interconnect Mailbag Segment Terminator
U1       Invalid Interconnect Mailbag Segment Type
V1       Missing or Partial IT Segment Detected
W1       Duplicate Mailbag Control Number for this Sender
X1       Unrecognizable Interconnect Mailbag Contents