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## org.optaplanner.core.api.domain.variable
Annotation Type InverseRelationShadowVariable

    @Target(value=METHOD)
    @Retention(value=RUNTIME)
    public @interface InverseRelationShadowVariable

Specifies that a bean property is the inverse of a `PlanningVariable`, which implies it's a shadow variable.

It is specified on a getter of a java bean property of a `PlanningEntity` class.

Required Element Summary
`String` | `sourceVariableName` In a bidirectional relationship, the shadow side (= the slave side) uses this property (and nothing else) to declare for which `PlanningVariable` (= the master side) it is a shadow.

Element Detail

### sourceVariableName

    public abstract String sourceVariableName

  In a bidirectional relationship, the shadow side (= the slave side) uses this property (and nothing else) to declare for which `PlanningVariable` (= the master side) it is a shadow.

  Both sides of a bidirectional relationship should be consistent: if A points to B then B must point to A. When the `Solver` changes a normal variable, it adjusts the shadow variable accordingly. In practice, the `Solver` ignores the shadow variables (except for consistency housekeeping).

  Returns:
    the variable property name on the opposite end of this bidirectional relationship

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