Super mare Mystic Journey was to have been the star attraction, contesting two local races before heading to Melbourne to defend her $5 million All-Star Mile title in March.

However owner Wayne Roser has advised Tasracing that Mystic Journey it is now "highly unlikely" to run in either the $50,000 Sky Stakes (1200m) at Mowbray on January 29 or $100,000 Thomas Lyons (1400m) at Elwick on February 9.

The reason is that the races are too close together.

Roser says the 11-day gap is insufficient for Mystic Journey to recover and would be detrimental to her welfare.

The Sky Stakes is the only suitable lead-up to the Thomas Lyons so if Mystic Journey does not run in that race she won't run in either. She would have to prepare for the All-Star Mile by racing in Melbourne.

Mystic Journey's trainer Adam Trinder, supported by the state's leading trainer Scott Brunton, made representations to Tasracing chief executive Paul Eriksson to have the Sky Stakes brought forward to January 22.

Roser understands the Tasmanian Turf Club supported the application "as did, I believe, almost all other persons in the industry who were approached."

However it was knocked back.

"That decision was very disappointing, as was the date and time of the notification to Adam, Scott and other persons - December 24 at 5.14pm," Roser said.

The owner has now taken his case to Tasracing chairman Gene Phair requesting in a letter that Eriksson's decision be overturned.

The retired Sydney barrister, who now lives at Sulpher Creek, has also advised Phair that Tasracing "should cease immediately" all promotions suggesting Mystic Journey would be running at the summer carnival.

"In my legal opinion any further promotion of this fact will be bordering on false and misleading advertising," Roser says.

"It is a basic principle of law that an organisation cannot advertise that a participant will attend an event, so as to entice persons to attend that event, when that participant may not attend."

Veteran pacer Black Centurian looked like being robbed of a chance to win a third St Marys Cup by a field selection error.

The 10-year-old didn't make the original field for Wednesday's $12,000 feature because he hadn't accumulated enough points at his previous five starts.

However, he had incorrectly been allocated only three points for his seventh placing in the $30,000 Tassie Golden Apple on December 21.

He should have been allocated seven points, as races worth $15,000 or more carry a four-point bonus for all placings.

Had he been given the correct points, he would have been in the field released last week and there would have been no need for the re-draw that took place on Monday morning.

The mistake was blamed on a "computer issue".

Black Centurian, who is one of three backmarkers on 20m, has previously won the St Marys Cup in 2015 (off the front) and 2019 (also off 20m).

The seven-race non-TAB meeting starts at 12.30pm with the feature event scheduled for 3.50pm.

Proven stayer Settler's Stone is topweight for Wednesday's $20,000 Longford Cup after a nomination mix-up forced a change of plan.

The John Blacker-trained gelding was to have tackled the Sheffield Cup nine days ago but his name was accidentally omitted when the stable was submitting its five nominations for the race.

The error was quickly corrected and Settler's Stone did appear on the original list of nominations but his name was subsequently removed after a ruling that his entry had been received outside the deadline.

Although there is a significant difference in prizemoney, the Longford Cup would be a nice consolation and does look an easier race.

Settler's Stone has a much higher rating - and hence 5kg more - than the majority of his rivals.

Although he's won only four races, the eight-year-old has earned $215,000 courtesy of a long list of minor placings in feature races.

There are seven races at the iconic meeting starting at 1.04pm, with the feature scheduled for 4.03pm.