Hi Garcia ,
In fact you are right :
i did this and it works :
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data : lr_entity1 TYPE REF TO CL_BSP_WD_VALUE_NODE .
lr_entity1 ?= me->typed_context->contpersaddressvalnode->collection_wrapper->get_current( ).
IF lr_entity1 IS BOUND.
lv_email = lr_entity1->get_property_as_string( 'E_MAILSMT' ).
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Thank you a lot 