I want to delete ABCD.ASM but its says item already exist. I think the error is that TC recognize ABCD_ASM same as the item I want to delete. I do not have any log errors that can be access. Please let me know your inputs. Usually we can export the dataset from ABCD_ASM then delete it so that I can delete ABCD.ASM as well. In this case I cannot delete ABCD_ASM because it is used or referenced by a lot of parts and assemblies.
File delete assembly is more complex, because all part is reference in the other assembly.
For your case, ABCD.ASM cant be delete same with ABCD_ASM please your check reference and make sure in structure manager all part was remove then save. back to item master ABCD file to delete it, plaese trying