It's well established fact the Seleucid Empire stretched into Pakistan and this fact is also established by the edicts of Ashoka. Unless you can show me a source which proves that the Seleucid empire didn't rule Pakistan then I will leave you with this:
"He (Seleucus) crossed the Indus and waged...
Seleucus I Nicator's invasion of India (c.306-303 BC) was one of a series of obscure campaigns fought by Seleucus in an attempt to gain control of the eastern part of his recently regained kingdom.
Seleucus was appointed Satrap of Babylon in 321 BC, and retained more of an eastern outlook that...