In the N4 client, open the Exchange Area form for the gate that has exchange lanes (Configuration 
Gate Exchange Areas Exchange Areas view Exchange Area form).
The Lane ID of the Yard Exchange Lane as defined on the Lanes tab of the Exchange Area form must match the block name plus the column names that you specify for the corresponding Straddle Grid in the Yard Model form. However, it is unlikely that this will be the case with the column names that are generated by default settings during the upgrade conversion from logical blocks of LANE type to stack blocks of Straddle Grid (or 'G') type.
While you review and adjust the naming, N4 validates whether:
The yard stack resolved by the lane ID belongs to the particular block for the selected exchange area.
The given lane ID resolves to a valid yard stack of:
Any grid-type block if no exchange area has been selected.
A block in the selected exchange area if an exchange area has been selected.
The lane ID includes the tier, such as P01.1 or P02.1, where the two digits after the first character represent the column and the digit after the period indicates the tier.
To review Gate Lane IDs:
In the N4 client, open the Exchange Area form for the gate that has exchange lanes (Configuration Gate Exchange Areas Exchange Areas view Exchange Area form).
The Lanes section lists the yard exchange lanes.
Review the ID value for each of these rows. In particular, count the number of characters, excluding any dot between the block name (which corresponds to the area name) and the lane number (which corresponds to the column name). For example, if you have gate exchange lane that has the ID 'EX1.3', there are four characters. Make sure to find the ID with the most characters. If you have more than 10 lanes, the ID might be EX1.15, and the number of characters is five.
Open the Yard Blocks view (Operations Yard Yard Blocks) and sort on the Block Type column.
Make note of the Label Format value for each Straddle Grid block, such as 'B1C2'.
Compare the combined number of characters available for the block and the column (with B1C2, there are three characters), to the number of characters in the gate exchange lane with the most characters.
If the number of characters is different, you must consider a new naming scheme that accommodates your operations and the seven-character limit for the ground position (block + column).
As an example, you might have two exchange areas that you currently call EXCH1 and EXCH2. One of them has 8 lanes, and the other has 15 lanes. On the Lanes section of the Exchange Area form, you currently name each lane with the convention 'B.C':
EXCH1.1, EXCH1.2, EXCH1.3, and so on, up to EXCH1.8
EXCH2.1, EXCH2.2, EXCH2.3, and so on, up to EXCH2.15
However, since the gate lane IDs must match the name defined by the yard blocks' label format for the combined area (in this case, a stack block) plus the column name specified in the yard model, you could consider renaming your gate lanes to the following, using the convention of B1C2.T1:
101.1, 102.1, 103.1, and so on, up to 108.1
201.1, 202.1, 203.1, and so on, up to 215.1
You would then rename the blocks and configure the naming scheme in Yard Editor using B1C2.T1 as the label format, making sure to match the column names to the gate lane names.
If the number of characters is the same, but the naming format is different, consider a new naming scheme for the gate lanes, as noted above.
As an example, you might have two gate exchange areas that you currently call, simply, '1' and '2'. Both of them have 8 lanes. In the Lanes tab of the Gate form, you currently name each lane by concatenating the area and lane names, to 'area.lane':
1.1, 1.2, 1.3, and so on, up to 1.8
2.1, 2.2, 2.3, and so on, up to 2.8
However, since the gate lane IDs must match the name defined by the yard blocks' label format for the combined area (in this case, a stack block) plus the column name specified in the yard model, you could consider renaming your gate lanes to the following, using the label format of 'B1C2':
101, 102, 103, and so on, up to 108
201, 202, 203, and so on, up to 208
You could then accept the default Straddle Grid yard block configurations in Yard Editor, which use B1C2 as the label format.
Rename your gate lanes as necessary, based on your deliberations in the previous step. See the application help or the Navis N4: Gate Administrator and User Guide for instructions.
Configure your converted straddle grid blocks to match your gate lanes. See the application help or the Navis N4: Gate Administrator and User Guide for instructions.