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PCo Query Write OPC UA Tag - Unable to convert value supplied for tag

Hi all,
I tried to write the value of an OPC UA Tag via PCo Query, but every time I get the error: "Unable to convert value supplied for tag [TAG] to required type."
MII Version 15.0 SP5 Patch 3
PCo Version 15.1.2.2745
OPC UA Server is hostet on a Siemens PLC.
I also tried to set the parameter "TagValueEncoded" on "true" without any success. Are there any further suggestions for this issue?
Thanks in advance!
Best regards,
Johannes

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