A riddle in sanskrit

I am presenting my first attempt at creating a new Sanskrit shloka which presents a riddle. 

Try to solve this riddle.

Here is my attempt at modifying an original verse that was taught to us in Parichaya module to create a similar riddle but rooted in a mythological context while still keeping prosody (छन्दस्) in mind

Riddle:

गुरूणा कथितं, छात्र, श्लोकं लिख ममाज्ञया |

न तेन लिखितः श्लोकः, शिक्षकाज्ञा न लङ्घिता ||

Translation:
A teacher (Sage Veda Vyasa) asked his student (Shri Ganesha) to write a verse (for his epic Mahabharata) according to his directions. Neither he wrote the verse nor did he disobey the teacher.

How is this possible?

Solution to the riddle:

Answer can be obtained by rearranging the words in the verse. Read the words न तेन as one word नतेन means 'with humility' or 'with his head bowed down'. Since Ganesha wrote the verse obediently, Vyasa was not disobeyed by him.

Original shloka: as taught in Parichaya levlel by Samskrita Bharati which gives us the same riddle as a father-son exchange.

तातेन कथितं, पुत्र, लेखं लिख ममाज्ञया |

न तेन लिखितो लेखः, पितुराज्ञा न लोपिता ||

Translation: A father asked his son to write a letter according to his directions. Neither he wrote the letter nor did he disobey the father. How is this possible?