[ACA-3382] Expression - Fix the obj reference

[mauriziovitale]

Please check if the PR fulfills these requirements

• The commit message follows our guidelines
• Tests for the changes have been added (for bug fixes / features)
• Docs have been added / updated (for bug fixes / features)

What kind of change does this PR introduce? (check one with "x")

• Bugfix
• Feature
• Code style update (formatting, local variables)
• Refactoring (no functional changes, no api changes)
• Build related changes
• Documentation
• Other... Please describe:

What is the current behaviour? (You can also link to an open issue here)

What is the new behaviour?

Does this PR introduce a breaking change? (check one with "x")

• Yes
• No

If this PR contains a breaking change, please describe the impact and migration path for existing applications: ...

Other information:

[codecov-commenter]

Codecov Report

Merging #5749 into develop will decrease coverage by 21.11%.
The diff coverage is 0.00%.

@@             Coverage Diff              @@
##           develop    #5749       +/-   ##
============================================
- Coverage    83.76%   62.65%   -21.12%     
============================================
  Files          943        8      -935     
  Lines        26796      324    -26472     
  Branches      3770       68     -3702     
============================================
- Hits         22446      203    -22243     
+ Misses        3225      111     -3114     
+ Partials      1125       10     -1115     

Impacted Files	Coverage Δ
...b/extensions/src/lib/services/extension.service.ts	88.00% <0.00%> (-1.19%)	⬇️
...rt-process/services/start-process-cloud.service.ts
...e/form/components/widgets/error/error.component.ts
...-services/src/lib/task-list/models/filter.model.ts
...ts/raphael/icons/raphael-icon-message.component.ts
lib/content-services/src/lib/upload/public-api.ts
...s/src/lib/app-list/select-apps-dialog.component.ts
...-services/src/lib/permission-manager/public-api.ts
...s-services/src/lib/attachment/attachment.module.ts
.../form/components/widgets/core/form-widget.model.ts
... and 926 more

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