Record Map - MAXLEN

I am trying to read in a data file via a Record Map and I am getting the following error...

ERROR #7201: Datatype value '030121_030121_030121_030121_030121_030121_030121_030121_030121_030121_030121_030121_030121_030121_030121_030121_030121_030121_B452' length longer than MAXLEN allowed of 50 > ERROR #5802: Datatype validation failed on property 'osuwmc.MatSys.DataStructures.MatSysIVT.Record:Bin', with value equal to "030121_030121_030121_030121_030121_030121_030121_030121_030121_030121_030121_030121_030121_030121_030121_030121_030121_030121_B452"

The field in question has a MAXLEN = 5000 see below. Why am I getting this error?