Journal entry for Reversal Gst

Pijush Roy (ERP SAP Functional Tester)   (281 Points)

27 June 2017  
Say, when we buy from unregistered dealer, we need to entry for both input and output gst like
Purchase AC Dr rs 10000
Input Gst rs 100
to Output Gst. rs 100
to creditor rs 10000

then I need to pay rs 100 to govt (say we are not sale the good) and take input credit for rs 100 but my above journal net payable is 0.
what is the entry need to create for that??