Compiler error C0144

Message: Inheritance only allowed in Functionblocks, Interfaces and Structures

Possible error cause: An attempt is made to use inheritance in an object that does not permit inheritance.

Error correction: Use ‎EXTENDS‎ in function blocks, interfaces, and structures only.

Example of the error:

PROGRAM PLC_PRG
VAR
	inst : DUT_1;
END_VAR

TYPE DUT:
(
	enum_member := 0
);
END_TYPE

TYPE DUT_1 EXTENDS DUT:
(
	enum_memberX := 0
);
END_TYPE

--> C0144: Inheritance only allowed in Functionblocks, Interfaces and Structures