To Disable the Approve Button From Inventory At User Level

Hide approve Button From user level through personalization.

User: OPERATION

Steps:
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Navigations: 

Inventory --> Move Orders  --> Move Orders

Enter the Form Personalization form.

Navigations: 

(M) Help --> Diagnostics --> Custom Code --> Personalize. 

Rules Sequence               : 10
Description                        : Disable Approve button
Leve                                      : Function
Enabled                               : Yes
Trigger Event                     : WHEN-NEW-FORM-INSTANCE
Trigger Object                   :
Processing Mode             : Not in Enter-Query Mode
Context                                                : User level and set value to your user name.--i.e "OPERATIONS"  User
Save your work.

Select the Actions tab.

Actions Sequence           : 10
Type                                      : Property
Object Type                       : Item
Target Object                    : TOMAI_MAIN_HEADER_BLK.DONE
Property Name                 : DISPLAYED
Value                                    : FALSE

Save your work and exit all form and re-enter and see the result. You will notice the the "Approve" button at the bottom of the form is no longer displayed from "OPERATION" Login