How to create a correct mapping between Oracle column and C# model property?

We are using linq2db. I have the table Pencil with the column PencilMin in Oracle database:

PencilMin NUMBER(6, 5)

And in C# I have the following class:

public class Pencil
{
	// ... the other code is omitted for the brebity
	[Column(Name = "PencilMin", DataType = LinqToDB.DataType.Decimal, 
		Precision = 6, Scale = 5, CanBeNull = true)]
	public decimal? PencilMin { get; set; }		
}

And my C# code to insert data:

long id = await dbContext.InsertWithInt64IdentityAsync(dbPencil);

And it generates the following SQL where the type of column PencilMin is incorrect:

--  Oracle.Managed Oracle12 (asynchronously)
DECLARE @PencilMin Decimal(2, 0) -- incorrect: should be NUMBER(6,5)
SET     @PencilMin = 11
DECLARE @IDENTITY_PARAMETER Decimal
SET     @IDENTITY_PARAMETER = NULL


INSERT INTO Foo.Pencil
(
	PencilMin
)
VALUES
(		
	:PencilMin
)
RETURNING 
	ID INTO :IDENTITY_PARAMETER

And the above code returns error:

ORA-01438: value larger than specified precision allowed for this column

I even tried datatype like this, however the result of generated SQL and Oracle error are the same:

[Column(Name = "PencilMin", DbType = "NUMBER(6,5")]
public decimal? PencilMin { get; set; }

Does anybody know how to create a desired mapping PencilMin NUMBER(10,6) by Column attribute placed in C# model class?

Additional information:

1. I run the folowing query SELECT BANNER_FULL FROM v$version and it shows Oracle Database 19c Enterprise Edition Release 19.0.0.0.0 - Production Version 19.14.0.0.0

2. there is no trigger for PencilMin field

3. ID column type is: "ID" NUMBER(17,0)

4. Actually, if I run the following query, then the record will be inserted in the database successfully:

--  Oracle.Managed Oracle12 (asynchronously)
DECLARE @PencilMin Decimal(2, 0)
SET     @PencilMin = 1
DECLARE @IDENTITY_PARAMETER Decimal
SET     @IDENTITY_PARAMETER = NULL

INSERT INTO Foo.Pencil
(
	PencilMin
)
VALUES
(	
	:PencilMin
)
RETURNING 
	ID INTO :IDENTITY_PARAMETER

[MaceWindu]

Thanks for update. As there is no issue here, I’m closing it. 11 cannot be stored in this field as it requires at least 2 as decimal positions, where your type has only 6-5=1

[sdanyliv]

Tested with the following model:

sealed class Pencil
{
	[Column] public int Id { get; set; }
	[Column(Name = "PencilMin", DataType = LinqToDB.DataType.Decimal, 
		Precision = 10, Scale = 6, 
		DbType = "NUMBER(10,6)",
		CanBeNull = true)]
	public decimal? PencilMin { get; set; }
}

With no exceptions:

db.Insert(new Pencil() { Id = 1, PencilMin = 11 });

-- Oracle.11.Managed Oracle11
DECLARE @Id Int32
SET     @Id = 1
DECLARE @PencilMin Decimal(2, 0)
SET     @PencilMin = 11

INSERT INTO "Pencil"
(
	"Id",
	"PencilMin"
)
VALUES
(
	:Id,
	:PencilMin
)