GST amendments: retrospective tax adjustments and compliance rules alter invoice, registration, credit and penalty liabilities. Amendments to the Haryana GST Act modify definitions to include specified territories and extend several provisions to services; adjust registration cancellation grounds; permit administrative extensions for compliance; enable the Government to designate or dispense with tax invoice requirements; require prescribed tax deduction at source certificates; alter transitional input tax credit timelines with retrospective effect; expand offence and penalty provisions to hold benefit retaining persons liable; extend limitation periods; amend Schedule II by removing 'whether or not for a consideration'; and provide specified retrospective exemption and rate adjustments without allowing refunds of tax already collected.