Update Schema Lines removes existing value mappings after latest fix

Fixed an issue where updating eDocument schema lines unintentionally cleared existing value mappings and static values. Existing configuration is now preserved while applying necessary structural changes.

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Fixed and improved

Update Schema Lines removes existing value mappings after latest fix#20153

Description: Fixed an issue where updating eDocument schema lines unintentionally cleared existing value mappings and static values. Existing configuration is now preserved while applying necessary structural changes.

Impact: eDocument schemas retain their configured mappings after updates, preventing incomplete or incorrect configurations. The update also continues to avoid duplicating existing schema nodes.