@oli

You're not doing anything wrong. DIB and Formula Builder in Excel are meant to be the authoritative sources of metadata for use with get_data method of Eikon Data APIs and with =TR function in Eikon Excel. The metadata is a living thing. New fields are being added all the time and sometimes some fields are deprecated. In the latter case these fields are removed from DIB and Formula builder to make them non discoverable, but they're still maintained for backwards compatibility, and people who happened to know about them or who previously used them in their data retrieval calls may continue using them. This is one possible explanation for why certain fields are not found in DIB and Formula Builder. Another explanation is that nothing is perfect. Sometimes fields could be removed unintentionally. If you come across cases, where fields you're interested in are not found in DIB and Formula Builder or where fields that once were available can no longer be discovered and there's no obvious replacement for them, the best course of action is to open a support case with Refinitiv Helpdesk, which can be reached by calling the Helpdesk number in your country, using Contact Us capability in Eikon application or by visiting MyRefinitiv.