Srm 7.0 - Hide field in web dynpro using configurations

Hello to all,
I'm trying to hide some fields on PO web dynpro. In this example on web dynpro /SAPSRM/WDC_DODC_PO_I_BD I start the component configuration /SAPSRM/WDCC_DODC_PO_I_BD, I search for the fields I want to hide and put the visibility attribute to Invisible and I mark final check box.
The fields don't dessapear from the web dynpro. Am I missing something?
Best regards,
Nacho

Thanks for your reply.
I have here two situations:
SPRO. If I add the field on Configure Field Control at Header Level/Item Level it disapears but not all fields appear on this transaction. For example, I can't do that to tolerance group (TOL_GP)
Webdynpro. Using Component Configuration of the dynpro. I guess that it is in two actions:
   - Change the value of visibility to Invisible on Web dynpro Built-In
   - Add field to context. I put for this example:
         Attributes of the Element usagesDefinition (ITEM_TOL.TOL_GP)
                 usageName ITEM_TOL.TOL_GP
                 componentName ITEM_TOL.TOL_GP
                 ConfigurationName /SAPSRM/WDCC_DODC_PO_I_BD
The webdynpro way doesn't work, Am I missing something?
Best regards,
Nacho

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