Subsection (1) provides that the Treasury may require the Scottish Ministers to provide such information, within such period and in such a form and manner, as the Treasury may reasonably specify.  This is necessary so as to enable the Treasury to obtain such information as it may require to, for example, monitor expenditure or compile other macroeconomic information on a UK basis.
Subsection (2) provides that if the information is not in their possession or under their control, the duty of the Scottish Ministers under subsection (1) is to take all reasonable steps to comply with the requirement.
Commentary Part V: Miscellaneous and General Details of Provisions