Diagnose
As a rule, each field name may appear only once on a screen.
The following exceptions apply:

• Names of subscreens

Subscreens have their own name range.

• Names for pairs of elements

Pairs of elements can be
an input/output field (template) and a text field with the same name(keyword)
a radio button and its associated text
a checkbox and its associated text
A link is created between fields with identical names. In other words,modifications affect both fields.

Procedure
Check your use of field names in the element list.