When the INC request is opened (View mode), the customer selects the "Assigned to Me" option; nevertheless, users receive the error "Required field not specified: undefined (ARERR 9424)". When we conduct the identical task in Edit Mode, the workflows process the request correctly and without problem.

STEPS TO REPRODUCE:
1) Create an incident and Assign it to a technician. (or) open any existing INC which is assigned to different user.
2) Either you can change the status into pending or open any existing ticke in pending status.
3) View full incident details and click on 'Assign to Me' button.

ACTUAL RESULT:

error "Required field not specified: undefined (ARERR 9424)

EXPECTED RESULT:

The error should not occur.

This is identified as PWA framework defect DRSMX-117461 and fixed in 25.4.00.

Due to the blank label for field 1000000881 on SV_View. If we don't make the field on SV_View required then that should help to perform the action.

Error log snippet.

Line 12823: mbs076zk | action 3
Line 12824: mbs076zk | commit action:
Line 12825: mbs076zk | Error - Error: PWA_ERROR_OUT
Line 12826: mbs076zk | ActiveLink End:- HPD:INC:SV_View_AssignToMe | HPD:Help Desk/SV_View

On further checking in logs, we noticed that below active link is marking field '1000000881' as required however this field does not have field label hence causing the issue. 

WORKAROUND:

1.Login to Developer studio

2. Open active link "HPD:INC:SV_ShowStatusReasonRequired"

3. Create overlay and modify the existing run if qualification

from

(('Status' = "Pending") OR ('Status' = "Resolved")) AND ($VUI$ LIKE "SV_%")

to

(('Status' = "Pending") OR ('Status' = "Resolved")) AND (($VUI$ = "SV_Edit") OR ($VUI$ = "SV_Create"))

4. Save the workflow 

NOTE: Perform midtier flush cache to take the effect