Hi,
I would suggest you the following:
1. Create a new field into the form i.e. new_warning_message (Do not show this field on form)
2. In plugin set the warning text in filed new_warning_message
3. In FomOnload, fetch entity field new_warning_message using Retrieve CRM Web Service SOAP via JScript (Example:
http://worldofdynamics.blogspot.com/2011/06/microsoft-dynamics-crm-2011-retrieve.html) check if the entity field
new_warning_message has text display it in warning message and then call Update CRM Web Service SOAP via JScript (http://mileyja.blogspot.com/2011/04/how-to-use-update-requests-in-net-and.html)
and set new_warning_message field value to null.
*If you will place the warning field on Form then after clearning the field either user have to save form or you have do it via
Xrm.Page.data.entity.save();
Jehanzeb Javeed
http://worldofdynamics.blogspot.com
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