Limitations to Assembly LLEG nodes

Hello

Is there a limitation to the number of nodes allowed in the ASSEMBLY LLEG command? We have a highly discretised launch rail (1m node spacing) and if we reference more than 53 nodes (per rail) we have an error:

*** PROGRAM ERROR: Record Number Specified is Out of mem_range. Could this be the number of nodes? We have tried referencing from both ends, both times limited to 53 nodes

Regards

John Davis