Why Punjabi is not an Educational and Official Language of Punjab?

Punjabi is spoken by 60% Punjabis as first language and 20% others speak Punjabi as second language in Pakistan.

Problem is not in speaking of Punjabi. Problem is of making Punjabi as an educational and official language of Punjab.

Urdu is not a langua-franca for international trade and business than, why Urdu is an educational and official language of Punjab? Why Punjabi is not an educational and official language of Punjab?

There is difference between national language of any nation and langua-franca for international trade and business. Punjabi is the national language of Punjabi nation and English is the langua-franca for international trade and business.

Langua-franca always take change according to the international trade and business requirement of nation but the national language always remain the national language of the nation. In past for centuries, Persian was the langua-franca for international trade and business in Punjab and it was replaced by the English.

Neither the Urdu is a national language of Punjabi nation and nor the Urdu is a langua-franca for international trade and business than; what is the justification for Urdu to be the educational and official language of Punjabi nation?