[求助]一级Financial Reporting and Analysis的Deferred tax Thank, method, current, liability, difference

judo

Schweser notes Book3 Financial Reporting and Analysis P119
example: to prepare a statement of cashflows under the indirect method
Step 4: subtract inreases in receivables and inventories and add increases of payables and Deferred taxes.

Question:
Deferred tax liabilites is under non-current liabilities, when converting to indirect method, only current asset and liabilities difference is added back..why is deferred tax liability being added back here in this case?
Thank you!