Florent Guillaume Why this mvel command shows @{Document.getParent(“DocumentType”)} me an error ? The type IEVP exist.

[Error: null pointer: Document.getParent("IEVP").getProperty("organization:code")]
[Near : {... Document.getParent("IEVP").get ....}]
             ^
[Line: 1, Column: 1]
at org.mvel2.optimizers.impl.refl.ReflectiveAccessorOptimizer.compileGetChain(ReflectiveAccessorOptimizer.java:450)
at org.mvel2.optimizers.impl.refl.ReflectiveAccessorOptimizer.optimizeAccessor(ReflectiveAccessorOptimizer.java:163)
at org.mvel2.optimizers.dynamic.DynamicOptimizer.optimizeAccessor(DynamicOptimizer.java:81)
at org.mvel2.ast.ASTNode.optimize(ASTNode.java:159)
at org.mvel2.ast.ASTNode.getReducedValueAccelerated(ASTNode.java:115)
at org.mvel2.ast.BinaryOperation.getReducedValueAccelerated(BinaryOperation.java:117)
at org.mvel2.ast.BinaryOperation.getReducedValueAccelerated(BinaryOperation.java:117)
at org.mvel2.ast.BinaryOperation.getReducedValueAccelerated(BinaryOperation.java:117)
at org.mvel2.ast.BinaryOperation.getReducedValueAccelerated(BinaryOperation.java:117)
at org.mvel2.compiler.ExecutableAccessor.getValue(ExecutableAccessor.java:42)