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Below are details from Workflow guide to Hide some standard buttons/content in the Notification mailer

#HIDE_MOREINFO Attribute

If you are using the Oracle Applications Framework-based version of the Worklist pages available with Oracle Workflow embedded in Oracle Applications, you can use a special message attribute with the internal name #HIDE_MOREINFO to hide the Request Information button in the Notification Details page. When users view a notification that requires a response from their Worklist page, the response region in the Notification Details page includes the Request Information button by default. If you want to prevent users from requesting more information about a notification, you can add the #HIDE_MOREINFO attribute to control whether the Request Information button is displayed or hidden.

Note: In both the standalone version of Oracle Workflow and the Oracle Applications version of Oracle Workflow, the #HIDE_MOREINFO attribute also determines whether the Request Information response link is included or excluded in HTML-formatted e-mail notifications. However, note that if the #HIDE_MOREINFO attribute is not defined for a particular notification, the default behavior is different for the Notification Details page and for HTML-formatted e-mail notifications. The Notification Details page displays the Request Information button if the #HIDE_MOREINFO attribute is not defined, while an HTML-formatted e-mail notification will exclude the Request Information response link by default if the #HIDE_MOREINFO attribute is not defined. To control this option in all interfaces where users access notifications, you should explicitly define and set the #HIDE_MOREINFO attribute. See: To Respond to an HTML E-mail Notification, Oracle Workflow User's Guide

The #HIDE_MOREINFO attribute must be either of type text or lookup. To hide the Request Information button, set the value of this attribute to Y. To display the Request Information button, set the value to N.

Note: It is recommended to define the #HIDE_MOREINFO attribute with a type of lookup and assign it the predefined Yes/No lookup type that is provided in the Standard item type. The Yes/No lookup type contains two lookup codes with the display names Yes and No, representing the values Y and N, respectively.

If you always want to hide the Request Information button for notifications using a particular message, specify the value Y as a constant.

If you only want to hide the Request Information button in certain cases, specify an item type attribute as the value. Then include logic in your workflow process that dynamically determines at runtime whether the button should be hidden or displayed and sets the item type attribute to Y or N, respectively.

Note: The Oracle Workflow web pages are being converted to the Oracle Applications Framework user interface format. Depending on your version of Oracle Workflow and which patches you have applied, you may see Oracle Workflow web pages in the new format or in the previous format. The new Worklist pages that include the Request Information button are currently available for the version of Oracle Workflow embedded in Oracle Applications.


#HIDE_REASSIGN Attribute

You can use a special message attribute with the internal name #HIDE_REASSIGN to hide the Reassign button in the Notification Detail web page. When users view a notification from their Worklist web page, the response section in the Notification Detail page includes the Reassign button by default. If you want to restrict users from reassigning a notification, you can add the #HIDE_REASSIGN attribute to control whether the Reassign button is displayed or hidden.

Note: If you are using the Oracle Applications Framework-based version of the Worklist pages available with Oracle Workflow embedded in Oracle Applications, the Notification Detail page may include the Delegate button or the Transfer button instead of the Reassign button, depending on the setting of the FND: Notification Reassign Mode profile option. The #HIDE_REASSIGN attribute controls the Delegate button and the Transfer button in the same way as the Reassign button. See: Setting the FND: Notification Reassign Mode Profile Option, Oracle Workflow Administrator's Guide.

If you are using the Oracle Applications Framework-based version of the Worklist and home pages available with Oracle Workflow embedded in Oracle Applications, then the #HIDE_REASSIGN attribute also controls whether a notification can be reassigned using the Reassign button in the Advanced Worklist, Personal Worklist, or self-service home page. The Reassign button in these pages will still be displayed, but an error message will appear if users attempt to reassign notifications for which the #HIDE_REASSIGN attribute has been set.

The #HIDE_REASSIGN attribute must be either of type text or lookup. To hide the Reassign button in the Notification Detail page, and to prevent reassignment from the Advanced Worklist, Personal Worklist, and self-service home page, set the value of this attribute to Y. To display the Reassign button in the Notification Detail page, and to allow reassignment from the Advanced Worklist, Personal Worklist, and self-service home page, set the value to N.

Note: It is recommended to define the #HIDE_REASSIGN attribute with a type of lookup and assign it the predefined Yes/No lookup type that is provided in the Standard item type. The Yes/No lookup type contains two lookup codes with the display names Yes and No, representing the values Y and N, respectively.

Courtesy: Oracle Workflow guide