RunOptions always warning "model states initialisation not defined" on GR1A model

The following code:

library(airGR)
data(L0123001)

InputsModel <- CreateInputsModel(FUN_MOD = RunModel_GR4J,
                                 DatesR = BasinObs$DatesR,
                                 Precip = BasinObs$P,
                                 PotEvap = BasinObs$E)
# conversion of InputsModel to target time step
InputsModel <- SeriesAggreg(InputsModel, Format = "%Y")

Ind_WarmUp <- seq(
  which(format(InputsModel$DatesR, format = "%Y")=="1985"),
  which(format(InputsModel$DatesR, format = "%Y")=="1985")
)
Ind_Run <- seq(
  which(format(InputsModel$DatesR, format = "%Y")=="1986"),
  which(format(InputsModel$DatesR, format = "%Y")=="2011")
)

# preparation of the RunOptions object
RunOptions <- CreateRunOptions(FUN_MOD = RunModel_GR1A,
                               InputsModel = InputsModel,
                               IndPeriod_Run = Ind_Run,
                               IndPeriod_WarmUp = Ind_WarmUp)

results with the following warning:

Warning message:
In CreateRunOptions(FUN_MOD = RunModel_GR1A, InputsModel = InputsModel,  :
  model states initialisation not defined: default configuration used

If I let the default warm up, the warning appears with the usual default warm-up warning:

RunOptions <- CreateRunOptions(FUN_MOD = RunModel_GR1A,
                               InputsModel = InputsModel,
                               IndPeriod_Run = Ind_Run)

There is still a warning indicating a wrong initialisation...

Warning messages:
1: In CreateRunOptions(FUN_MOD = RunModel_GR1A, InputsModel = InputsModel,  :
  model warm up period not defined: default configuration used
  the year preceding the run period is used 

2: In CreateRunOptions(FUN_MOD = RunModel_GR1A, InputsModel = InputsModel,  :
  model states initialisation not defined: default configuration used

Is it a normal behavior? I don't see any clue about this in the documentation.