Read Only Fields Show Only Hidden Option in Business Rules for My Activity Center, Person Activity Center, and Team Activity Center
In the Business Rules Editor for My Activity Center, Person Activity Center, and Team Activity Center, only the Hidden option is available for read only fields. Other options like Required, Read Only, and Value are not available for read only fields.

Businesss rule to make only the Hidden value as visible for read only feilds
The Business Rules Editor enables you to hide the fields which are read-only. Other options that are not applicable for read only fields are no longer available, thereby ensuring an intuitive experience.
Steps to enable and configure
For more information, refer to this topic in the Oracle Help Center: How do I hide or show a field in Visual Builder Studio?
Key resources
For more information, refer to this topic on the Oracle Help Center:
- Overview of Activity Centers, in the Using Global Human Resources guide
Here are the topics we recommend on getting started with Express Mode.
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Refer to the following documentation in this order:
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Express Mode in VBS for detailed instructions on using specific Express Mode features.
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Extending Redwood Applications for HCM and SCM Using VB Studio for details on what’s supported by HCM.
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You can refer to the VB Studio documentation "Configure an Oracle Cloud Application" to check the steps to access VB Studio from a Redwood page.
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Extending HCM Redwood Applications Using Visual Builder Studio
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Refer to the Customer Connect forum Visual Builder Studio for HCM