EXTERNAL-ENTITY rule condition conflict.
#2104 Compile-time error
EXTERNAL-ENTITY rule condition conflict.
Additional Information
An unconditional rule for the external entity 'X' has
already been entered, so no other rules are permitted.
or
Previous rules for the external entity 'X' have conditions, so the
current one requires one as well.
Recovery
Compilation continues but no compiled source code file will be saved.
Explanation
It is an error if more than one external-entity rule can be
selected at any one time and any particular external entity can appear
in either only one rule without a condition or several conditional
rules.