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3267182 - "Value of parameter Key is not correct" 500 Internal Server Error happens with drop down list in Webdynpro ABAP program after UR update

Symptom

500 Internal Server Error: "Value of parameter Key is not correct" happens with drop down list in Webdynpro ABAP program after UR update.

It happens to various Webdynpro programs. Below ST22 dump is generated at the same time:

Category               ABAP programming error
Runtime Errors         UNCAUGHT_EXCEPTION
Except.                CX_WDR_ADAPTER_UNKNOWN_EVENT
ABAP Program           CL_NW7_VIEW_ELEMENT_ADAPTER===CP
Application Component  BC-WD-ABA-REN


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Environment

Webdynpro ABAP program (e.g., soamanger, saml2)

Keywords

Value of parameter Key is not correct, 500 Internal Server Error, drop down, dropdown, drop down list, saml2, soamanager, lightspeed.js, Runtime version mismatch, UNCAUGHT_EXCEPTION, CX_WDR_ADAPTER_UNKNOWN_EVENT, CL_NW7_VIEW_ELEMENT_ADAPTER, 500 , KBA , BC-WD-ABA , Web Dynpro ABAP , Problem

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