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Before the audit, TSM inventory has no identifier for K7 barcode value <>

tsm: TSM1> show slots lib3500 
PVR slot information for library LB0.1.0.2.
Library : LB0.1.0.2
Product Id : 3576-MTL
Support module : 4

Mount count : 0

Drives : 5
Slots : 118
Changers : 1
Import/Exports : 6

Device : \\.\Changer0

Drive 0, element 256
Drive 1, element 257
Drive 2, element 258
Drive 3, element 259
Drive 4, element 260

Changer 0, element 1

ImpExp 0, element number 16
ImpExp 1, element number 17
ImpExp 2, element number 18
ImpExp 3, element number 19
ImpExp 4, element number 20
ImpExp 5, element number 21
Slot 0, status Allocated, element number 4096, barcode present, barcode value <>, devT=LTO, mediaT=417, elemT=ANY
Slot 1, status Allocated, element number 4097, barcode present, barcode value <>, devT=LTO, mediaT=417, elemT=ANY
Slot 2, status Allocated, element number 4098, barcode present, barcode value <>, devT=LTO, mediaT=417, elemT=ANY
Slot 3, status Allocated, element number 4099, barcode present, barcode value <>, devT=LTO, mediaT=417, elemT=ANY
...

Synchronize the inventory. If needed you can additionally do an inventory on the physical library (depending on library, directly on the panel or on web interface)

tsm: TSM1> audit library lib3500 checklabel=barcode

When process is finished, TSM inventory must be correct:

tsm: TSM1> show slots lib3500 
PVR slot information for library LB0.1.0.2.
Library : LB0.1.0.2
Product Id : 3576-MTL
Support module : 4

Mount count : 0

Drives : 5
Slots : 118
Changers : 1
Import/Exports : 6

Device : \\.\Changer0

Drive 0, element 256
Drive 1, element 257
Drive 2, element 258
Drive 3, element 259
Drive 4, element 260

Changer 0, element 1

ImpExp 0, element number 16
ImpExp 1, element number 17
ImpExp 2, element number 18
ImpExp 3, element number 19
ImpExp 4, element number 20
ImpExp 5, element number 21
Slot 0, status Allocated, element number 4096, barcode present, barcode value <VAL082L3>, devT=LTO, mediaT=417, elemT=ANY
Slot 1, status Allocated, element number 4097, barcode present, barcode value <Empty>, devT=LTO, mediaT=417, elemT=ANY
Slot 2, status Allocated, element number 4098, barcode present, barcode value <VAL130L3>, devT=LTO, mediaT=417, elemT=ANY
Slot 3, status Allocated, element number 4099, barcode present, barcode value <VAL026L3>, devT=LTO, mediaT=417, elemT=ANY
...