I am currently assisting on a research on cross border capital flows.
A common problem seems to be that both the acquisition of assets and valuation effects determine the cross border asset holdings as , for example, reported in the CPIS data. Hobza and Zeugner use the BoP statistics on portfolio investments to derive valuation effects on portfolio debt and equity (change in asset holdings minus acquisitions) (2014).
I am wondering if the valuation effect could also be estimated because I do not only want to distinguish between portfolio debt and equity but also between different types of instruments.
For instance, between different debt maturities.