A method of informing a network node, NN, (12, 1000) of a network about at least one sidelink-related radio access capability of a remote communication unit, RMCU, (14, 900) to enable configuring a relay path between the RMCU (14, 900) and the NN via a relay communication unit, RLCU, (2, 4, 6, 8, 800) connected to the NN (12, 1000), the method being performed by the RLCU (2, 4, 6, 8, 800) and comprising: receiving (1102, 1412), from the RMCU (14, 900), first capability information indicative of at least one sidelink-related radio access capability of the RMCU (14, 900), wherein the first capability information, before being transmitted to the NN, is enriched by the RLCU with a first index assigned to the at least one capability indicated by the first capability information, the first index associating the at least one capability indicated by the first capability information with the communication unit (800, 900) having the at least one capability; and transmitting (1104, 1414) the first capability information to the NN (12, 1000); wherein the method further comprises: - receiving, from the NN (12, 1000), first configuration information indicative of a first relay path configuration for a relay path between the RMCU (14, 900) and the NN (12, 1000) via the RLCU (2, 4, 6, 8, 800); - determining, based on a second index comprised in the first configuration information and associating the first relay path configuration with the RMCU, that the first relay path information is intended for the RMCU; and - transmitting the first configuration information to the RMCU (14, 900) only if it is determined that the first configuration information is intended for the RMCU; or - receiving, from the NN (12, 1000), rejection information indicative of the NN (12, 1000) not determining a first relay path configuration for a relay path between the RMCU (14, 900) and the NN (12, 1000) via the RLCU (2, 4, 6, 8, 800); - determining, based on a second index comprised in the rejection information and associating the rejection information to the RMCU (14, 900), that the rejection information is intended for the RMCU (14, 900); and - transmitting the rejection information to the RMCU (14, 900) only if it is determined that the rejection information is intended for the RMCU (14, 900). receiving (1102, 1412), from the RMCU (14, 900), first capability information indicative of at least one sidelink-related radio access capability of the RMCU (14, 900), wherein the first capability information, before being transmitted to the NN, is enriched by the RLCU with a first index assigned to the at least one capability indicated by the first capability information, the first index associating the at least one capability indicated by the first capability information with the communication unit (800, 900) having the at least one capability; and transmitting (1104, 1414) the first capability information to the NN (12, 1000); - receiving, from the NN (12, 1000), first configuration information indicative of a first relay path configuration for a relay path between the RMCU (14, 900) and the NN (12, 1000) via the RLCU (2, 4, 6, 8, 800); - determining, based on a second index comprised in the first configuration information and associating the first relay path configuration with the RMCU, that the first relay path information is intended for the RMCU; and - transmitting the first configuration information to the RMCU (14, 900) only if it is determined that the first configuration information is intended for the RMCU; or - receiving, from the NN (12, 1000), rejection information indicative of the NN (12, 1000) not determining a first relay path configuration for a relay path between the RMCU (14, 900) and the NN (12, 1000) via the RLCU (2, 4, 6, 8, 800); - determining, based on a second index comprised in the rejection information and associating the rejection information to the RMCU (14, 900), that the rejection information is intended for the RMCU (14, 900); and - transmitting the rejection information to the RMCU (14, 900) only if it is determined that the rejection information is intended for the RMCU (14, 900).