# Multiple data sources - **Content part**: 1 of 1 Source: https://openfunds.org/knowledge/whitepapers/multiple-data-sources. Automatically included from openfunds white papers. - **Collection**: 0d28ca68-062f-4fe8-a4b1-1037c9ec453c - **Reference ID**: 846619f2-f570-5bbe-ba86-372bd992f22a - **Type**: Web link - **URL**: https://openfunds.org/knowledge/whitepapers/multiple-data-sources - **License**: Creative Commons Attribution-NoDerivatives 4.0 International License (CC-BY-ND-4.0). Users may freely use, redistribute, and commercially apply the content free of charge, provided it remains in its unaltered form. Credit: www.openfunds.org. 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Its license (Creative Commons Attribution-NoDerivatives 4.0 International License (CC-BY-ND-4.0)) permits reproducing it word for word and in full. ## Outline - "The openfunds standard improves quality and efficiency in the exchange, validation and analysis of fund information" - Multiple data sources - How to scope data with multiple sources in openfunds - The issue - Solution - Complementary Data - OFST999999 - [IGNORE] Command - The best solution to choose - Document Information - Revision History - Implementation - Joining openfunds - openfunds Members --- # Multiple data sources | openfunds > How to scope data with multiple sources in openfunds The issue Fund data from fund houses can be hosted independently at locations in different countries. This could lead to problems, e.g., when two locations send the same data records having different values to the same data recipient. Source: https://openfunds.org/knowledge/whitepapers/multiple-data-sources ## "The openfunds standard improves quality and efficiency in the exchange, validation and analysis of fund information" © 2025 openfunds.org, all rights reserved. Disclaimer and Privacy Policy. - Home - Fields Current Version - Next Version - Previous Versions - Roadmap - Knowledge Frequently Asked Questions - White Papers - Practical Tools - News - About About Us - Members - Licence - Contact - Log In # Multiple data sources # How to scope data with multiple sources in openfunds ## The issue Fund data from fund houses can be hosted independently at locations in different countries. This could lead to problems, e.g., when two locations send the same data records having different values to the same data recipient. The data which first reaches the recipient will be deleted by the second data record. The graphic below illustrates an example in which two locations send two spreadsheets to a data recipient, whereby the data in grey is provided by both sources. Although A has the data ownership, these data are deleted by B, since B has sent the data to the recipient after A did. ## Solution This problem can be solved by the fact that the fund house knows which source has data ownership. It can thus prevent the fields from the data ownership possessor from being deleted. There are three possibilities in openfunds to ensure this: - Complementary Data - OFST999999 - [IGNORE] command ## Complementary Data The first possibility to solve this problem is to send complementary data. That means, what A sends, B does not and vice versa. If this possibility cannot be implemented, one of the other two options should be chosen. ## OFST999999 OFST999999 replaces the previously sent OF-ID and tells the recipient to ignore the values in it. E.g., if B has technical reasons to send the same data records like “OFST005010 Umbrella” as A, B can transmit such data using the field “OFST999999 Field To Ignore”. In doing so, the records of A will not be deleted as the recipient will ignore the records coming from B. This field can be used as often as required in a spreadsheet as shown below. ## [IGNORE] Command The openfunds standard follows the principle of mirrored databases. This means that if the sender exports all data from its database and the recipient imports it, the two databases should contain identical data. If you send a flat file with a value in a certain field and later send an update where the same field is empty, the initial value will be deleted. That means an empty field leads to a deletion of a value. For more information about empty fields, please consider our white paper Ambiguity of Empty Fields. To avoid any deletion of a value in the receiving database, openfunds recommends using the “[IGNORE]” command instead of an empty field (including square brackets and all capital letters). ## The best solution to choose The solution that is easiest to implement should be chosen. If consistent fund house databases should be constructed, then it can be done based on one of the three options described above. These solutions can be used not only for internal records, but also for external ones in order to avoid the unintentional deletion of data. ## Document Information ### Revision History ## Implementation If you have any questions about the new data type or difficulties with implementation please contact us at businessoffice@openfunds.org. ## Joining openfunds If your firm has a need to reliably send or receive fund data, you are more than welcome to use the openfunds fields and definitions free-of-charge. Interested parties can contact the openfunds association by sending an email to: businessoffice@openfunds.org openfunds.org c/o Balmer-Etienne AG Bederstrasse 66 CH-8002 Zurich Tel.: +41 44 286 80 20 Email: businessoffice@openfunds.org If you wish to read or download this white paper as PDF, please click here. #### openfunds Members The openfunds standard improves quality and efficiency in the exchange, validation and analysis of fund information © 2025 openfunds.org, all rights reserved. Disclaimer and Privacy Policy.