Given a semantic defined on a computed field,
When you try to update the computed value directly on the card (no modal access)
a fatal error is raised:

( ! ) Catchable fatal error: Argument 1 passed to Tracker_FormElement_Field_Computed::getStorableValue() must be an array, string given, called in /usr/share/tuleap/plugins/tracker/include/Tracker/FormElement/Tracker_FormElement_Field_Computed.class.php on line 977 and defined in /usr/share/tuleap/plugins/tracker/include/Tracker/FormElement/Tracker_FormElement_Field_Computed.class.php on line 982
Call Stack
#TimeMemoryFunctionLocation
10.0000647592{main}( )../index.php:0
20.06829931816TrackerManager->process( )../index.php:33
30.06839932072TrackerManager->processSubElement( )../TrackerManager.class.php:128
40.076012722888Tracker_Artifact->process( )../TrackerManager.class.php:90
50.076212758400Tracker_Action_UpdateArtifact->process( )../Tracker_Artifact.class.php:751
60.078713691648Tracker_Artifact->createNewChangeset( )../UpdateArtifact.class.php:61
70.083214665256Tracker_Artifact_Changeset_NewChangesetCreatorBase->create( )../Tracker_Artifact.class.php:1119
80.108115724040Tracker_Artifact_Changeset_NewChangesetCreatorBase->storeFieldsValues( )../NewChangesetCreatorBase.class.php:101
90.113915810864Tracker_Artifact_Changeset_NewChangesetCreator->saveNewChangesetForField( )../NewChangesetCreatorBase.class.php:159
100.114115810960Tracker_FormElement_Field->saveNewChangeset( )../NewChangesetCreator.class.php:63
110.114615812128Tracker_FormElement_Field_Computed->saveValue( )../Tracker_FormElement_Field.class.php:1116
120.114915812128Tracker_FormElement_Field_Computed->getStorableValue( )../Tracker_FormElement_Field_Computed.class.php:977