Single-valued attribute saved as an array [1, 2] and cannot be cleared during inline edit in Process Plan Browser (Windchill 12.0.2.9)

Hello everyone,

We are experiencing an unexpected behavior when editing an attribute on a Process Plan within the Process Plan Browser. I would like to check if this is a known bug (SPR) in Windchill 12.0.2.9 or if there is any workaround/configuration fix available.

Environment:

• Windchill Version: 12.0.2.9

• Module: MPMLink (Process Plan Browser)

• Object Type: MPMProcessPlan

Issue Description: When updating a custom string attribute directly from the Attributes tab (child tab) of the Process Plan Browser:

1. Value gets appended as an array: If the current value is 1, and we delete 1 and type 2, upon refreshing/reloading the browser, the attribute value turns into [1, 2].

2. Cannot clear the attribute: If we delete the entire text to leave the field completely blank and save, the previous value is not cleared and persists after refreshing.

What we have already verified:

• Attribute Definition: Checked in Type and Attribute Management — the attribute is explicitly configured as Single-Valued (Multi-Valued is set to No).

• Browser Autocomplete / Extensions: Tested in Incognito/Private browsing mode with all extensions and browser translation turned off, but the issue still persists. This appears to be coming from the client-side JavaScript parameter serialization or the JCA inline-edit handler.

Has anyone encountered this issue or a similar SPR where inline editing sends duplicate parameters resulting in array formatting ([...]) and fails to detect empty strings as dirty?

Any insights or related PTC Article / SPR references would be greatly appreciated.

Thank you!