How to check a linked issue when creating another issue?

[Elena]

Hi,

We need to add a validator when creating an issue. Specifically, we need to check if the Linked Issues Field is complete. If the field is filled, then we need to check whether the required fields are filled with specific values ​​in the linked issue. How do I write the Linked Issues Field in a sil-script and check the field values ​​in this linked issue?