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

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

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

Urdu is not a lingua-Franca for international trade and business, then why Urdu is an educational and an official language of Punjab? Why Punjabi is not an educator and an official language of Punjab?

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

Langua-Franca always takes change according to the international trade and business requirement of the nation, but the national language always remains the national language of the nation. In the past, for centuries, Persian was the lingua-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?