Update merge-duplicate-records.md

Author: mspilde

powerapps-docs/user/merge-duplicate-records.md

@@ -58,4 +58,17 @@ Common Data Service includes duplicate detection rules for accounts and contacts
 >   - When  you're using Dynamics 365 for Outlook and you go from offline to online.  
 >   - When you import data using the Import Data wizard.  
 > 
->   Duplicates aren't detected when you merge records, save an activity as completed, or change the status of a record, such as activating or reactivating a record.  
+>   Duplicates aren't detected when you merge records, save an activity as completed, or change the status of a record, such as activating or reactivating a record.
+
+> [!INFORMATION]
+>  Some fields may not show in the merge record dialog
+> 
+> - If a field or control matches any of the following conditions, it will not show up in merge dialog:  
+>   - The containing section is invisible in form descriptor or form xml regardless whether the section actually shows up in runtime.  It is possible to show using client API.
+>   - The control does not have a classid property.
+>   - The attribute's metadata ValidForUpdate is false.
+>   - The control is Quick Form Collection Control or Reference Panel Quick Form Collection Control.
+>   - The attribute's metadata ValidForUpdate is false.
+>   - The attribute is Picklist or MultiSelectPickList and it has either a parent picklist or child picklist attribute.
+>   - The attribute is parentaccountid on account, this is a system setting and can not be changed.
+>   - The attribute is parentcustomerid on contact - this is a system setting and can not be changed.