There is no attribute defined.

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PetraBeamlineInfo Class Dynamic Attributes
Name	Inherited	Abstract	Attr. type	R/W type	Data type	Level	Description
UserDynamicAttributeR	false	false	Scalar	READ	Tango::DEV_DOUBLE	OPERATOR
UserDynamicAttributeRW	false	false	Scalar	READ_WRITE	Tango::DEV_DOUBLE	OPERATOR