Translation tables need to appear in pairs.

Document ID : KB000009365
Last Modified Date : 14/02/2018
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Introduction:

This document describes the most likely reason for occurrence of error messages
XCOMN0456E Cannot open EBCDIC-ASCII translation file.
and
XCOMN0457E Cannot open ASCII-EBCDIC translation file.

Instructions:

When using transfer tables during a transfer you may specify CODETABL=<xxx> where <xxx> can be any combination of characters. This allows you to use a specific transfer table for a transfer and frees you from the restriction of one transfer table for all transfers.

But when you code CODETABL=<xxx> you need to provide both tables: the <xxx>atoe.tab for transfers from ASCII to EBCDIC and <xxx>etoa.tab for transfers from EBCDIC to ASCII. If one of both tables is missing the transfer is not executed and error message
XCOMN0456E Cannot open EBCDIC-ASCII translation file.
or
XCOMN0457E Cannot open ASCII-EBCDIC translation file.
is displayed instead.