Guides ChangeLog - Added Service codes

Service codes added to Reference page

• Service codes have been added to the reference page that contained HS codes only. As a result, the page slug has also changed from https://ng.docs.digitax.tech/reference/reference-hs-hsn-code-files#/ to https://ng.docs.digitax.tech/reference/reference-hs-service-code-files

  Access the new page: Reference: HS/ HSN and Service codes - files here