DYN_KEY_DUPLICATE is an ABAP runtime error which you may come across when using or developing within an SAP system. See below for the standard details explaining what it means and how you can avoid or fix this runtime error.
Short Dump Classification: A - ABAP Programming Error
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Duplicative dynamic key specification.
Please see abap error for more details about the possible cause of this runtime error and how it could be avoided.
When accessing the internal table <runtime parameter> with a statement that allows
explicite key specification (for example, READ, DELETE, SORT), an
illegal dynamic key specification of the form "(name)" was used. The key
component <runtime parameter> was either specified duplicatively, or an overlapping
with another key component (probably statically specified) occurred.
Please see abap error for more details about the possible cause of this runtime error and how it could be avoided.