FPEM077 DYNALLOC returned Return code `<V1>`, Reason code x'`<V2>`'

Explanation
An unusual condition occurred during data set allocation.
<V1> is the return code.

<V2> is the reason code.

User response
See MVS Messages
and Codes (or the corresponding manual of the MVS version you have installed) for an explanation
of the return code and reason code.