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# Why can't the package be modified after I have created it?

This is related to billing and how the consumed data is charged.

For example, you created a package with specific QoS, country availability, included data volume, duration etc. Next, you assigned this package to some SIM or eSIM card. At this moment the MTX Connect billing system starts counting the consumed data and time in accordance with the rules you specified when creating the package. At this stage, if you change the settings of this package, the information about traffic consumption that has already been saved in the billing system will not correspond to the new settings of the package, which will lead to incorrect tariffication.