Merge branch '98-fix-service-order-validation' into 'develop'

Fix Service Order validation

See merge request !97

(cherry picked from commit 17b7a9ed)

e51adf3f Merge branch 'develop' into 'main'
6aa4042d Preparation for Release 2025Q4
4ec5eb03 Merge branch '2025Q4_RC' into 'main'
f8626fc3  Fix Service Order Validation
896dedd9 add order item validation
61fc1c5b Fix and add unittests

Co-authored-by: Kostis Trantzas <ktrantzas@ece.upatras.gr>