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Why are there sometimes differences between International Investment Position (IIP) and Coordinated Portfolio Investment Survey (CPIS) data?

The concepts and valuation principles underlying the CPIS are the same as those contained in the sixth edition of the Balance of Payments and International Investment Position Manual (BPM6) for valuing the IIP, and so the value of portfolio investment assets in both the CPIS and the IIP should in principle be the same. For most of the CPIS-reporting economies, the datasets are consistent, with some variances arising from differences in time of recording. For a few economies, there are more substantial differences, which are sometimes due to incomplete sectoral coverage in the CPIS or different data vintages (i.e., the IIP and CPIS may be compiled at different times. Hence, one may have more up-to-date data). For both the CPIS and IIP, portfolio investment securities should be valued at market prices. A few CPIS reporting economies do not compile IIP statistics.

IIP data are found 

The CPIS dataset can be found 

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