KE21N: termination CONVT_OVERFLOW if value field too large

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Symptom
When you enter an actual line item in CO-PA with transaction KE21N, a program termination occurs if you enter a value field with too many characters on the tab page ‘Value fields’.
Other terms
CONVT_OVERFLOW, CX_SY_CONVERSION_OVERFLOW, overflow, conversion
Reason and Prerequisites
There is a program error.
Solution
Implement the attached correction. After you have done this, the system issues [...]