@Friedtjof not sure if a developer forum can help you with that.
I think there is a Value Chain (VCHAIN) app for Supplier/Customer information. Besides that, I do not know whether there is a structured data set devoted to this, but you can always search the news, check Topic:ALLCE in the News monitor app on Eikon.
For more information, I would suggest contacting your local Refinitiv support desk or your representative.
@Friedtjof not sure what you mean, could you please elaborate?
I require information about alliances between firms. I define an alliance as anyvoluntarily initiated cooperative agreement between firms that involves exchange, sharing, or co-development,and it can include contributions by partners of capital, technology, or firm-specific assets.
