Adjusting Contract Line Value does not adjust the progress percentage on Track Completion

Summary:

When updating the contract line value, the track completion percentage value should be also be adjusted. However the system is not updating the percentage, meaning new contract line value is invoiced the next time invoicing is generated. We need to system to update the percentages on track completion every time a contract line value is edited. Refer to example below. 

Contract Line amount is 100,000 and the track complete percentage is 100% Also the invoiced value is 100,000

Updated Contract line amount to 150,000

The track Completion remains the same as 100%
we are currently changing it manually to 66.6%

Is there any configuration or steps which needs to be followed so that the track completion will be updated accordingly???